tThere's nothing better than proving someone wrong.
When someone says you're not "good enough" or "you can't do that because..." it's the biggest self esteem booster.
Keep in mind, you don't have to prove yourself to anyone. Because no one is better than you and you don't have to physically show them, but when it's something that you want, that's extremely important to you and your success, you better prove them wrong.
You are capable of doing anything and everything you set your mind to do.
Don't let anyone put you down, especially if it's something you really want. You don't need to bow your head down to anyone.
If there's something you want to do or accomplish and someone has told you "that's impossible" or "you're incapable, there's no way." I tell you to prove them wrong. Show them what you're made of and make them respect you even more.