I'm Trying to Not Fall Apart

so my life right now seems hard. I work full time, school part time, and help care for my boyfriend's 90 year old Mother who has Damentia. Tonight, I miss my life. I have not had a steady boyfriend in years and now I feel like I have to share him with a woman that's more important than me.
her house went to foreclosure, so I found one. I bought it and did all I could so no one would be homeless or need to give anything up. but the rest of the family, does not help, just pushes us around. and we don't have access to her income to help with care so we can work. I can't afford to take care of everyone.
I miss my life, I miss going out, I miss going to school. since I have missed two weeks of school to care for his Mom. I miss my family. I can no longer save for a vehicle.
I wish he and I could have a life outside of our living room. I wish I didn't have to constantly worry, I wish wish... I wish I could make friends, be a part of something, be in a choir, do things that used to be a part of me. but now. just ugh. I feel lost. my mom cries alot, hoping I won't always have burdens. that one day I can be happy and in control of my life. I just tell her maybe one day.