Take a good look at who is in the mirror. It's you. This person in the mirror is you, and you'll never be able to escape from this person. He is your role model, he is your first lover, he is your listener.
Treat the one inside the mirror with respect, believe in him, smile at him every morning, and, most importantly, be proud of him.
Be proud of yourself.
You don't have to lie to people because you're afraid they'll judge you. You don't have to reproach and blame yourself over everything that happen. You don't have to feel lousy about yourself. Perhaps you're a little crazy, you're weird, you're one of the least well-informed person, you feel you're stupid and have achieved nothing, but you must never lose faith in yourself. You live for yourself, this is your life. It is important. To some people, it may not be, but it is your everything.
And accept that people may not like you. But you are just a part of their lives, except for your family, best friends, and partner, if you have one. And your pets and mentees and students and whoever. But to others, you are just there because you are there. This doesn't make you invaluable. Know this and dismiss the need to impress. Instead, be yourself and make mistakes. Let people judge. Let people hate.
In the end, being strong is key. Being happy is key.
Being yourself is key.