What to do!?

Hi I’m in a 28 year old, oldest of 3 and i feel left out. I have always helped out when asked, can’t lift heavy things for the life of me, gets yelled at for it. I’m always the odd one out, the butt of a lot of jokes. Can’t regulate my emotions, when I get angry I just cry. Always heat about something last. I feel like my parents care more for my sister who is the middle child. My brother does get some attention but he rarely calls and visits because he works a lot. Answer to what I do about it I appreciate. I just need to vent to someone about this.