<human>: As the title says I think my friends are dragging me down...

I'm in year 11 and doing NCEA Level 1 and I'm failing..I need to get 80 credits and so far I've only got 4. 

In my classes no one I hang with really don't do any work so I don't and I talk to them

All we do at free periods and class breaks is smoke marijuana and tobacco. 

I don't want to be this way I want to pass and I want to be healthy I don't want to be stressed I don't know what to do and I don't want to be dragged down from my friends even if it is my fault..

It doesn't help that my crush who sits on the field got a girlfriend and seeing him there every day doesn't help.

I don't know how to say no to smoking up, and in all honesty I like it.

I love my friends and I don't want to stop talking and hanging out with them but my education isn't doing good and I'm really failing.. I don't know what to do. 

I just I really don't know what I'm supposed to do and I'm stressing out so much about it...

I have nothing going for me, I'm at the bad end in my BMI, I'm stupid, and I'm a people pleaser and can't stand up for myself.

I just want to pass reddit what do I do...

Can you condense the text into a few key points?
<bot>: I feel like my friends are dragging me down but I think it's just me but I don't know what to do