<human>: Can you condense the text into a few key points?

If anybody does actually read this, I seem to be in a fairly good relationship with a girl I love (am 24, she is 23), but she has now decided we can't go on unless I can commit to moving in, getting engaged, marriage and family in the near (but apparently not immediate) future. Fair enough I guess, she has had a few boyfriends and long term relationships, and decided im worthwhile. I on the other hand have never had a girlfriend before her, and not really had any good friends who happen to be female. To be quite damn honest I'm still a bit scared of girls (others at least), which I guess is a bit sad. I have a reasonable degree, and I'm not entirely socially inept, nor do I dont think I'm struggling in terms of looks, I could certainly have other options. I just don't know if I should move forward without considering what else could be, she also seems to understand that we may need to do this, for my sake. Strangely she suggested it, seeing others for a while, to allow us (or really me) to know for sure if she is the one. This of course would cause her immense pain, which I dont know if she/I can deal with. It also doesn't really seem morally correct to put somebody through so much pain, or even expect them to deal with that. She thinks this may be the only way to avoid the "what if" thoughts later on in life. She has proven to be a lot more understanding and mature than I ever thought possible tbh. Thoughts?
<bot>: Marry first and only long term gf, without any experience with other girls (and keep wondering "what if")?