Feeling unappreciated

I need to vent.... When I was 16 my mom had my little brother. My mom was pretty abusive. I dealt with all the abuse. Was beaten constantly. When she got pregnant the dad went to prison. He's doing life for first degree murder. He murdered his 15 year old brother. My mom left my baby brother with me... And would leave... Sometimes for days at a time... She would go and stay gone for a long time.... Until one day... She didn't come back.... She left me in this apartment at 16 with a baby brother. So I had to figure stuff out. I survived, between working and stealing... I dropped out of school. Worked and would leave rent in the mail box and drop off the money for our bills saying my mom was at work. I was scared of what would happen to my brother if people knew. When I turned 18 I got us an apartment in my name. When I turned 21 I knew to put my brother in school I needed to get custody so I contacted cps myself and told them everything. They hunted my mother down. Found her but she never showed up to court so I got custody. When my brother started school I got my GED. I put him before everyone. A boyfriend. School. Friends. My brother is 15 now and we stay in a house. Renting. I was cleaning out my brother's backpack and I saw a school paper. They were doing a mom and muffins thing at his school. I asked about it and he said "Yeah.... They pull kids out if class for a few hours to spend time with their moms and get muffins". They also had dad and donuts. I asked why he never asked me to go and I would love to go with him. He said "I don't want you to". I felt hurt and asked why. He said "Because I don't need more people pittying me!" "Poor George. Dad's a murderer! Mom left him! He has to bring his sister to PARENT events! I'm tired of pitty and being made fun of!" He went to his room. In so hurt right now. I did everything I can for him. I'm not his mom or dad... I understand that... But have I not done a good job in those roles?