Can I tell my stepdad to clean my room?
That doesn't seem right. Why do you think your room needs to be cleaned?
I find lots of garbage in my room
I don't think it's a good idea to tell your stepdad to clean your room. Cleaning your room is your responsibility, so you shouldn't try to pass it off to someone else.
It's my responsibility, not his to clean my room. I'm just frustrated and I don't care anymore.
Starting to clean is hard and frustrating task but it needs to be done. Just start in one spot and clean little by little and take care of your own room.