I feel guilty for ignoring my hamster?

I got my hamster 1 year ago and i really like the little guy, but the problem is that i never hold him because he bites.. he was a biter ever since i first got him. I chose him out of other hamsters because he was all alone in a corner while the other hamsters were with eachother all together so i felt bad for him and chose him, i feel as if i've been leaving him there all bored with nothing to do and i feel guilty. I also start to feel guilty because he caught his legs in th bars of his cage and now they have red marks, i wanna take him t the vet but my mom says he's okay, he still walks and everything but i feel guilty.. what can i do to get over the guilt?