Why  can't people I like care about me? Like I like this girl and she doesny care about me and it hurts?

So move on. There's nothing you or any of us can do about it. Maybe stop chasing t*ts and a** and you'll find someone who actually gives a damn about you. 

Attraction is a two-way street and if you keep finding yourself attracted to people who aren't attracted to you it's time to do some soul searching. Most people like those who have shared interests, similar life goals, senses of humor that are in sync and mutual physical traits. Make a list of everything you like about this girl and be honest with yourself about whether she's really a good match for you. Too often we get blinded by appearance and never stop to consider that looks are fleeting and what makes relationships work is personalities that go well together. 

you can't make people care about you, you just have to move on without them.

Maybe she is thinking the same way about you. Meet and talk to her.

Because shitty  personality women go for bad boys and call men shallow and dogs but don't worry the right person will come to you when you won't expect it or least expect it.  Media like movies brainwashed them.

People cannot choose their feelings.
That’s life.   Live with it

It would certainly be nice if people automatically cared about us just because we cared about them, but that's not how it works.

My first teenage crush? I'm not even sure he even realized I existed, despite being my next door neighbour.

My first head-over-heels infatuation crazy about him crush? He noticed me when I was sixteen, then over a period of some six months, pretended to like me so he could make a fool of me in front of the entire school. It took me a long time to get over that, but it also taught me a very valuable lesson about human nature.

Then later when I was in my mid 20's there was this older guy I liked a lot. We went out on a date, and I came home to a message from him telling me straight out that he wasn't feeling it.

Yeah, it hurts, but it's a part of life and a part of being human. You lick your wounds, pick yourself up, you work on yourself, and you move on until you meet someone who loves you back.

you shouldn't have to worry about what others think of you really, if you like them and they don't like you, wait for the one. you'll know they're the one when they start caring abt you more than anything else. they will make you their number 1 priority!  
If the person you like doesn't even care about you in the slightest way, give up on them. if they don't care bout you, why do you care about them?? move on! good luck! also I know how you feel I'm currently stuck in the friend zone. it will get better!

Did you ever ask her out on a date?  Maybe try that

theres probably other people that care about you