Am I not really good enough for the people I care about? Why can't they appreciate me?

The only one you need to worry about accepting you and appreciating you is God! Not everyone is going to like you but God is love!

You can't control what others think or feel.
But you can have a strong say over your own perception of your self worth.
Build your self up first before you start analyzing how you think others see you...becaûse, at the end of the day, you will only have yourself to trust the most.

How do you expect anyone else to love you if you dont love yourself? Believe in yourself more be more positive and have the confidence to show them how strong and comfortable with who you're.

They're either going to like you or not no matter what you do so don't worry about them

Only you can decide that. But you must be true to yourself. If you’ve hand-on/heart done the best you can for them and they don’t appreciate you, then those people are not suited to be cared about, and you should try and find new people.

because for the most part, people don't care about others...except for parents and "MAYBE" one other person.