Is it just a self-esteem issue or something worse? And what can i do about it?!

Is it just a self-esteem issue or something worse? And what can i do about it?

help me please i don't know what's wrong with me. I'll try not to ramble but so anyway here it is:
1. I never feel i can do anything so i don't try cuz i tell myself whats the point if you can't do it? like i don't try in school because i don't think i can get good grades so i don't try even though i manage C's and B's and even a couple of A's anyway, but i'm failing math because i really believe i can't do it. And i've always wanted to write a novel so now i'm writing one and i've gotten really far into it but i think its a crappy novel so i want to quit and that happens with everything. Should i finish the novel just to prove i can? or is it a waste of time?
2. I never talk because i really do think there's no point because no one cares how i feel or what i think and i don't want to bother them with my dumb feelings
3. whenever i look into the mirror i always think and tell myself how stupid and ugly and worthless i am
4. i hate to eat because i feel i don't deserve it

2 weeks ago
5. i feel worthless
6. i bully my brother constantly and i don't even know why, but i'm trying to stop
7.i can't stand looking at pictures or reflections of myself

anyone else ever feel like this? and if so what can i do?

oh yeah can i do something besides professional help if i need that cuz if i go for help everyone will make fun of me

You need to see a professional.... don't worry about anyone else.. this is important for YOU....

Also.. you did know that if you see a therapist.. counselor.. what ever.. they BY LAW can not disclose ANYTHING you talk about.. to ANYONE.... heck they can't even SAY if your a paitent of theirs.... soo no one even needs to know your seeing someone....

There is something far more going on here than a self esteem issue.... please please please seek professional help AS SOON AS POSSIBLE!