Why did you raise your younger sister until she was 18? Did she go off to university?
You can also party and fuck around in your 30s. It's different than 20s of course, but still great!
Also, I'd try to refrain from comparing yourself go the "normal" life. You've clearly had a unique journey (beyond "normal" might be in TV shows), and I am certain you've learnt a lot through it.
You're clearly a legend for looking after your family in the way that you did. I am sure your brother's and sisters will appreciate it in the future if they've not made it clear already.