I feel like I have bad friends?

I feel like I have bad friends... At recess they make fun of me a lot, and I feel like they use me... My friend that i sit beside in a lot of my classes makes me take down a lot of her notes, and do her Home work. I don't even know why I actually do it, and my friends make me pay a lot for when we go to the movies. I have a job, so they always say 'im so rich' and never bring there wallets for when we hang out. They always want to have sleepovers at my house, but when I ask them can't we have it at theres, they say no. I have spent over like 400 dollars probably on them becuz they refuse to pay for there own purchases. I finished middle school today, and im going to my cottage the whole summer. I have a lot more friends there,and there really nice so should I still keep in contact with my 5 other friends? Im also going to a different school than them next year so i wont see them anymore. Im really quiet at school, so i think thats why they take advantage of me, but im going to change over the summer! And ill make better friends. But should i just never talk to them ever again or keep on talking to them? thxx :)