Why don't I have fun when I go out anymore?

I am 22 yrs old and I live in LA. I have a lot of good friends that go out all the time and I even work at one of the busiest nightclubs in LA but somehow I don't seem to have fun when I'm out partying. I feel like I'm in someone elses body just waiting for the night to be over so I can go to sleep. I forgot what it feels like to be excited to do something or anxious and I feel numb and emotionless. Literally I could win a brand new car and not be excited as anyone else. When I wake up there really isn't anything to look forward to, its just another day with things to check off on the to do list. I feel empty and Ive really been considering taking something to feel normal. I think there might be something wrong with me, but I dont want to self diagnose myself either. Has anyone else ever felt like this or is feeling like this? And if so, what did you do to get back to normal again because for the past year I really have been neglecting my health (Im diabetic type 1) because I simply do not care about anything that much. I even went to the hospital bc I had a seizure and when I got home I felt like it was just another day. NOTHING FAZES ME at all it's getting really weird. I honestly dont care if I die tomorrow thats how bad it is, I feel like the guy in the fight club movie emotionless and empty inside. I dont know what to do anymore.