What do I do

My bf is 30 and has had many “relationships” in his life and he now wants to spend the rest of his life with me and he’s always saying things about how we’ll buy a house, get a dog, have kids etc. I’m around 20 and this is my first ever relationship and I love him so much and would love to spend my life with him it’s just this is the only life I’ll get and I’ve never wanted to only ever have been with one guy my whole life. I want to experience other relationships and other sexual partners and also not have the pressure of a serious relationship for a bit. Do u think I should break up with him and experience the world or stay with him forever. Both options are good but they’re also both bad. I just wish I met him a few years later😔