Missed out on teenage years

Hi. I got really sick in my early teens and wasn't able to experience anything since I was stuck inside 100% of the time. I'm in my 20s now and feel so far behind everyone my age.

I don't usually cry but have ended up bawling my eyes out because the pain gets so bad from missing out on years of life.

I still feel like a 14-year-old on the inside and don't know what to do anymore. I feel this pain every day and I just want it to stop. Does anyone have any suggestions on how I could maybe accept the past, and also be ok with my current age?

Thanks so much