<human>: We have been together for 5 years now. I love her; she loves me and our relationship is in a great place.
However, she was the first girl i was ever with. Sex, kiss, date, romantic relationship etc. she was my first everything. She has alot more experience than me in all those things. Im not the jealous type; im not bothered her "numbers" are higher than mine at all; what always seems to enter my mind is the fact i havnt been with ANYONE else. 
I still feel that i want to experience more firsts; more first dates etc. On the other hand she doesnt feel the same. We have spoken about this in the past and my feelings have upset her before (which i expected). I do feel i want to spend the rest of my life with her but at the same time want to experience a life without her. Is this selfish?
Am i a shitty boyfriend or is this normal?
Im scared if i break up with her it will be messy; with her blaming herself/cursing me out and bringing up how i just want sex with other women or that i will lose my bestfriend and never see her again.

How does one approach this situation- am i being irrational and selfish?

Can you give me a shortened version of the text?
<bot>: my SO is my first. Want to experience relationships with other people. Still love her. Not sure what to do.