Am I with the right person or am I just jealous?

When I first started dating my girlfriend, like most relationships, it was great. Both of us seemed to be on the same wavelength, and as interested in each other as the other was. We have a long distance relationship, and see each most weekends. When we are together, we get on great in each other’s company. We have being seeing each other 5 months.
Everyone loves her, she’s beautiful and fun. She has so many friends, from her home, from college, from different jobs, friends made through friends of friends etc., its huge! I on the other hand, don’t have many friends at all, and very few I would see regularly. I am a very likable normal guy, and I think I’m very funny. I’m not a recluse and prefer to hang out with people. I get on well with people, can chat away easily to strangers, or to her friends when I meet them for the first time etc. I don’t suffer from any social anxiety but I never seem to make a connection or am interested to make them long term friends. Being with my GF really highlights how little I have in my life.
During the week, I’m either at work, or maybe the gym/running. I don’t have friends who would call me to meet up etc, or many living nearby to call over. I’m living here nearly 3 years, and other than the work social life, I wouldn’t have much options for socializing. I’m embarrassed to tell her I don’t know anyone up here when she comes to visit. She nearly always has someone wanting to meet her when they know she’s up. I know I haven’t done anything to make friends too, but that’s another post . When I go out with someone, I drop everything else, and everyone. I have always preferred to hang out with my girlfriend. I always make them the center of attention, and make them the top priority. I’ve done this even when I had friends around like in school or college. And rightly or wrongly, it worked OK for my previous girlfriends, but she is different, which I’m hoping it good! I’ve tried to stop this and not make a deal out of it if she’s busy some weekends for example. With me not having an active social life, it’s always her-self that’s busy, not the other way around.
She comes from a big family where they are all close, and friends with each other’s friends. Their home sounds like a mad house, plenty of goings on, people coming and going, parties etc. My home life is so different. A third of us has either died and another third immigrated. I know different doesn’t seem bad, and my family does get on with each other, we just don’t have the same closeness and fun they seem to have.
She has traveled a lot over the years too, did the usual Oz & South America etc. plus a few more. She has these stories of just heading off and seeing all these amazing places. I’ve traveled a good bit through Europe, but I never went that far. I don’t know where my 20’s went without giving it too much thought to go travelling. I seemed to think of work (it’s not as though I’m career motivated and worked in great jobs) and be happy with the few hols a year.
As I spent most of my 20’s with the wrong girl and not realizing it until I had wasted so many years, I wanted to ask if you think we are too totally different people, who won’t find common ground, or are these just stupid jealousies I have that need to be resolved and got over? I know people say opposites attract, but I don’t trust my own judgement fully after my past mistakes. Are my doubts based on these jealousies or is it that I think we aren’t a good match?
Sorry for the long rant, hope you can help me on this.