Be a bad friend or be a good friend?

So in my class, i think i was the most hated but everyone still enjoy and chill to hang out with. Maybe i always rude, didn't have much the hospitality to care but deep down i always took care of them, i just don't show it all. So when i did some mistakes, they would mock me and trying to make me feel down. But the people who made me feel that way were the same people who always asking me to help on our class assignment or any help at all. I obviously helped them but i always think why would they need me but in the same time they're the ones who mocked me. I just don't understand. Should i go on strike by not care for them or should i still be good and be cool about it?