I [27m] have been seeing my first and only girlfriend [26] for a good year now. We've been getting along just fine, with our own share of minor arguments along the way that have been taken care of and not buried in some deep dark corner. 

Now, the topic of marriage has popped up, and there's one thing that she has expressed concern over, and it's the fact that I have never dated seriously before I met her. On her end, she has had 4 other relationships, with me being her fifth boyfriend. She has gone as far as saying that if I decided to break up with her because I wanted to see other girls, she wouldn't hold that against me. 

In response, I've told her, and even felt that because we click so well and have so many things we share in common, I could not possibly think of breaking up with her, and that it would take a lot for me to let her go. To be honest, if I had the financial means right now, I would go out, buy a ring and immediately propose to her. That's how much I love her. I can picture being with her for the rest of my life - a sentiment she has echoed. 

That leads to this question: am I really missing out because I haven't had other relationships? I've heard that the point of dating is to get to know what one's preferences, expectations and dislikes are, and to tweak it until one finds his or her match. On top of that, I also heard it's almost never a good idea to marry your first love. So, what gives?
user
Marriage has popped up between GF and me. GF is worried I may regret marrying
assistant
I [27m] have been seeing my first and only girlfriend [26] for a good year now. We've been getting along just fine, with our own share of minor arguments along the way that have been taken care of and not buried in some deep dark corner. 

Now, the topic of marriage has popped up, and there's one thing that she has expressed concern over, and it's the fact that I have never dated seriously before I met her. On her end, she has had 4 other relationships, with me being her fifth boyfriend. She has gone as far as saying that if I decided to break up with her because I wanted to see other girls, she wouldn't hold that against me. 

In response, I've told her, and even felt that because we click so well and have so many things we share in common, I could not possibly think of breaking up with her, and that it would take a lot for me to let her go. To be honest, if I had the financial means right now, I would go out, buy a ring and immediately propose to her. That's how much I love her. I can picture being with her for the rest of my life - a sentiment she has echoed. 

That leads to this question: am I really missing out because I haven't had other relationships? I've heard that the point of dating is to get to know what one's preferences, expectations and dislikes are, and to tweak it until one finds his or her match. On top of that, I also heard it's almost never a good idea to marry your first love. So, what gives?
user
I'm in a relationship that has never been anything but great. My girlfriend is worried
assistant