I just need someone to listen

Please don't read unless willing to listen. This is not the most normal thing to talk about but I just need to let it out. This is kinda a rant so I'm not completely asking for advice and most definitely not asking for harsh comments. Okay, so to get to it, I am in a serious relationship with my girlfriend. My girlfriend and I are in a serious relationship and plan to get married in the future. I love her, and please after going through the rest, don't say that I don't because of what's happening. So she is actually my first relationship, I never put myself out there before meeting her. The reason for this post is, I feel like I need to be regretful for not being in other relationships. I am still very lost in my own life and have grown up keeping things with me in the back of my mind, things that don't actually work. Sorry that doesn't make sense. I get thoughts in the back of my head as well, that don't go away. I want to ignore them and move on but they are always there. Back to the point, when someone says something or a thought pops up in my head, it stays there. I began thinking on the fact that I'm not sure if I want to try to "experience dating", the problem is that I love and fully plan to have a long future with my girlfriend. She even actually brought this up herself, and I told her that I had thought of it. I told her that I wanted to be with her and I don't know. I'm going to talk to her again, more seriously. Honestly I just want to get rid of the thought itself. Sorry, that was a very long and annoying post, it was also probably very confusing.