According to Tiffany:

Confidence-Boosting Techniques

- Implement a well-balanced diet. How you think and feel directly influences how you act.

- Challenge that inner critic. When it gets too loud, ask it where it is coming from. Figure out if there is anything you can do to change the way you think and feel. Make a list of all fears and worries and come up with solutions.

- Live in the moment—all the time. Pay attention to what's happening to you right now. Just sit on it and do nothing or sleep on it until you have a clear state of mind to think about your problems.

- Stay true to who you are. Confidence is about being true to yourself and being comfortable in your own skin. Love yourself for everything that you are. Stay true to yourself. Believe in yourself and trust your instincts.

It takes practice to feel confident.

What makes the difference? Your attitude and the intention behind everything you do.

A Book in Time's Commentary:

PPS CLIP:

Professionally and Personally:

Confidence

According to Forbes.com, “Confidence is built on different things, but overall, it is built on choices and accomplishments that feed your passion, and that makes you feel happy and proud of who you are.” Discovering them is definitely a worthwhile pursuit.

Ways to build your confidence:

Accomplish Things. You ultimately feel better about yourself when you accomplish both small and large goals. Establish daily, weekly, monthly, and yearly goals. Even the small daily goals strengthen your confidence "muscles" and invigorate you to set bigger and more ambitious goals. The progress may be incremental, so do not get discouraged as you practice this skill.
Monitor Your Progress. It is often difficult to acknowledge an accomplishment if the progress is not being monitored. Monitoring will allow you to gauge and quantify your progress and help you to stay on course, building confidence as you see the progress in real-time.
Do What is Right. Make sure your choices and decisions align with your belief and value systems. This defines your character and builds confidence as you live by your set standards.
Be Fearless. Fears will, unfortunately, creep into anything worth doing. Know your ultimate goal, muster your courage, and overcome your fears. There are many ways to decrease or eliminate fears that will inevitably reveal themselves at the most inopportune times. Remind yourself of your determination to accomplish your goals; that fear is a false feeling of something that has not even occurred.
Exercise. Energize yourself with some exercise to improve focus and decrease stress. Exercising will also improve cognition plus many other good-feeling health benefits. Consider lifting some light weights, or even heavy ones, for that matter. Improving your muscle tone is an instant confidence builder. You can’t help but feel better about yourself with a bit of definition.
"Hear" Constructive Criticism. If something you presented or accomplished is met with a critical response, hear what is said and consider the value of it. Perhaps it will be a valuable eye-opener to an area you could easily improve or enhance. However, if you know what they said is inaccurate, be logical, internalize this truth, and disregard their emotional-based comment. Stand behind your work and the belief that what you created has value.
Do as You Say. Show integrity by doing what you said you would do. Subconsciously, your mind will be aligned with your actions, strengthening your self-confidence. It will also gain you the respect of others, which also will build confidence.
Think Long-Term. When you know your destination, you are more confident along the way, making choices that align with the future. It provides a blueprint to guide you, which builds more confidence in you and your decisions. This will also give you peace of mind by laying a solid foundation for long-term goals knowing each short-term challenge or sacrifice is a stepping stone to a bigger goal.
Be Resolute. The further along your journey to success that you travel, and the more goals you begin to achieve, the more critical people will cross your path, feeling the need to judge or challenge you. Understand that this is a weakness in them, generally a feeling of jealousy for what ‘they’ have not accomplished. It is not actually about you, but rather it is an insecurity in them. Let it be water off a duck’s back, knowing that you expected people to react to you this way. It is a great sign that you are growing in your mission of success!
Be Content. Be content on your journey and choose your emotions. Choose to be happy. Yet even as challenges come your way, and they will, you can still be content and confident knowing you have all the tools you need to overcome each of them.

“Don’t listen to negative influences. Believe in yourself, and show others what you can do. Only “you” can find your potential.” Marla Runyan

"No one can make you feel inferior without your consent."

Eleanor Roosevelt

Spiritually:

Spiritual Integrity

Spiritual integrity is about being true to who you are. You know what you want and align all choices and decisions with this value. There is an honest relationship with your feelings, and you embrace your human, vulnerable self. This is exemplified in all areas of your life and acts as a guide, simplifying your decision-making experience. While obstacles may arise to challenge a situation, using your spiritual integrity, you can transform the parts of you that characterize something as an obstacle. Aligning your actions with spiritual integrity is a freeing expression of self-love as you abide by the "honor code" you designed for yourself.

According to newharbinger.com, "Spiritual integrity is the state of being undivided together with the quality of brutal self-honesty." It is the combination of a state and a quality, which demands self-awareness and an uncompromising willingness to be authentic. This is not an easy undertaking! You must be humble, confident, reliable, open, and unceasingly honest. And you must take responsibility for your blind spots and learn the skill of discernment, humility, and discretion, so your mind may grow quiet enough to hear the direction of your values.