<human>: My girlfriend swears she is happy in our relationship. We have been together a year and have a wonderful relationship, but I feel like I am not good enough a lot of the time. A lot of it stems from me not being of age to go to a bar (just 5 months shy now) so we have to make alternate plans. I had also only been with one girl prior to our relationship and feel like she's a lot more experienced than me, which is great and all, but it does leave me feeling bad about myself sometimes. She claims her ex boyfriend was super controlling and verbally abusive, and she's much happier with how our relationship is now, but I've personally met her boyfriend on a few occasions and did not get this vibe at all. They also are semi-friendly and keep in touch, and this bothers me. I have tried addressing this to her several times and she just kind of shrugs it off and is not very convincing to me about the whole thing. I don't want to be controlling towards her so I sort of let it slide. So Reddit, am I being paranoid or weird about the situation, or is there a real flaw in our relationship?

Summarize the given text in a few sentences.
<bot>: my girlfriend is older and more experienced, and keeps in touch with her older ex bf. Should I be concerned?