[Berries and Cream]

Of course life will only get better if you change for the better. Everyone is built differently and some people need to work a tad bit harder in getting good grades. Just have the confidence and the will to pull through and remind yourself that you can do anything
As for friends, just go out of your comfort zone and talk to someone you never hung out with. You never know!
The only way to get people to stop bullying you is to tell them straight in the face to stop. Don't give them the satisfaction of thinking that they are better than you.

I'm not the best at giving advice but I hope this helps