How do I stop being depressed?

"Before আপনি diagnose yourself with depression অথবা low self-esteem , first make sure
that আপনি are not, in fact, simply surrounded দ্বারা assholes."
- William Gibson
From what I've heard, আপনি have a really unsupportive group of people surrounding you. No wonder আপনি feel so low. It's definitely hard to remain happy, optimistic অথবা positive when negativity surrounds you. First try talking to your parents. Tell them politely but firmly that আপনি think your brother's antics are going out of hand and to take matters into hand when his antics are starting to get nasty. Of course, a little bit of sibling fight is healthy, but as long as matters stay in hand. And for those people, who are making আপনি feel bad, ignore them. They just won't be able to feel good about themselves until they hurt somebody. Sometimes if they get that their cheap mindgames are not breaking through to you, they may drop it. But if আপনি find that, with every time আপনি remain silent their bullying increases, speak up and give them a peice of your mind so that আপনি will able to sleep well and peacefully at night.
And as a last resort, try moving out as soon as আপনি can and try hanging out with a new group of friends. Hope everything works out for you. Good luck :)

Well actually I had and am facing similar depression from past 2 weeks. Yesterday I cried all দিন because of a person.

But আপনি know what crying for people who really don't care about আপনি is a waste of time and I have realized it. If your parents don't care about it then don't cry like a coward and just let them know that if they don't care আপনি won't care about them too.

A tip as your বন্ধু bully আপনি (they aren't actually your বন্ধু then but your enemy) ignore them, be আরো confident and read inspiring books, engage your self in সঙ্গীত (it will give আপনি relieve) and instead of listening sad songs and cry try to listen pop songs and enjoy them. সরানো out for a walk when আপনি feel আপনি are loosing your self and enjoy nature.

ফটোগ্রাফি is a good way to express your feelings to the world. আপনি can write a diary so that there'll be someone whom আপনি can tell everything.

Paper is আরো patient than people and they won't share your secrets অথবা make fun of you. Plus লেখা diary in English will improve your লেখা and speaking skills. আপনি can always use a dictionary.
Don't hurt (physically) your brother back as maybe it could make the situation worse. Because he could attack আরো violently.

And feel free to talk to me anytime আপনি want. I will listen to you. Because I feel strangers can understand your অথবা mine problem better than our close persons.

Be Positive ^_^
Lots of hugs