feeling frustrated

Check out info. about cognitive distortions. Sometimes they can mess up our perception of reality and makes us think that people are playing favorites (when they're not) or have something against us (when they don't).

But if after reading about that and confronting your feelings with reality, you still think they're being unfair (and have evidence to back it up, as in: it's messing with your grades), I suggest you speak to the teacher directly about your concerns and work it out. But if it's not affecting your reality: don't pay any mind to it. We can't control what other people do or don't, but something we can control is how we react to it. Ask yourself if you'd rather see yourself as someone's victim or as a full human being with enough agency to not let others' actions affect you. The latter is probably the healthiest option you've got!!

Best of luck in your path, buddy :) Keep us updated!