Rant- Brother and Nephew.

My oldest brother just moved back home with his 1 year old son. I love them both so much but I can't take the stress anymore. His nephew doesn't like me even though I try to bond with him. I know it will take time. I am a 20 year old full time college student, I work, and I'm taking summer classes. When my nephew wakes up, my brother also wakes up. Then my brother wakes ME up also to help him take care of his son. For example: To feed him, to watch him while he uses the restroom, to play video games.I'm exhausted and I always ask him to not wake me up. He's going back to college and he expects me to take ALL online classes so I can stay with his son while he goes to work and college on campus. Every time I try to take care of him, he cries and I'm starting to lose my patience and get frustrated. I have a life too and I'm not the one that decided to have a baby. He did. It shouldn't be my responsibility to take care of his child because I'm trying to further my education and get a career. Am I wrong to feel this way?