Well yesterday walking home from school my girlfriend said that we need to talk and said things are not working out like how we use to be and that things changed and she said she still loves me

I'm very sorry to hear about this :( I had to deal with the same thing a few weeks back my boyfriend.. wanted a break and he said he "loved me" still and he wanted to be with me.. but wanted to see other people.. your girl seems to really care about you a great deal still.. but maybe she wants a break or is pressured to be in a relationship right now because of school... give it time and give her the space she needs.. when she's ready and she truly loves you she'll come back when the times right... trust me the chips will fall into place ;) evrything happens for a reason.. and if it doesn't happen to work out (I'm not saying it won't though) at least you guys can keep a mutual friendship.. hope this helps:)

Regardless of what your other half says at the time of a break up, I am sorry to inform you that a break up is a break up. She might still care for you as feelings don't ever instantly fade, it takes time. But her decision has been taken, for whatever the reason may be, you two are no longer together. Break ups happen and they happen often we learn from them as if they were a mistake even though sometimes we didn't do anything wrong. Start focusing on school and keep yourself preoccupied, time will heal you so just give it a chance. You will see, sooner than you think, you will find someone else who you like even more.

Good Luck,
Javi

She may still love you but not enough to stay with you romantically. It happens that way sometimes.