<human>: I have been talking to a guy for 5 months. Recently we told each other that we really liked each other and both concluded that it was heading toward dating. Enter all of my insecurities.

He dated a girl a few years ago for a couple months and they seemed to have been madly in love. I was very stupid and found his Instagram and curiosity got the best of me. Countless #wcw posts and posts about how she was the prettiest and most amazing girl he's ever met and that he loves her. They ended things but still remain good friends as they are both involved in an independent music scene and have many mutual friends. This girl seemed like his dream come true! They are still on great terms. I've met her a few times and she's really nice and welcoming of me into their music scene and her and him get along great. My question is why did they break up and why am I here?!? Why is he interested in me when she just seems like way more of what he wants in a relationship. 

During their relationship they took so many pictures together, went on so many adventures, and just seemed to have had such a great time. I look at them and think about doing similar things with him, and I just can't picture myself doing them. Going to the beach, taking road trips across states, taking selfies together. I just don't get it. 

I've never been in a relationship, and maybe they're just not for me? I really like this guy, and we get along and have fun with each other, but I just don't think I could ever be as good as his ex and I can see that bothering me so much in the future. Do I just throw in the towel?

Can you condense the text into three sentences or less?
<bot>: I have a shit ton of insecurities, can't compare to the ex of the guy I am talking to, how do I help myself???