<human>: Can you summarize the given text in a few sentences?

I've been in a long distance relationship for over a year and a half now and we have been getting along great, she's a perfect fit for me, however she is over 5000 miles away and we've only seen each other once for 2 weeks this past winter and she will be coming here to visit for 3 weeks. In the past few months I've been having an increasing amount of thoughts about the hopelessness of our relationship, especially now that there is a possibility I will go study abroad next year for a whole year and she is planning on studying abroad for half a year as well; adding distance to the distance.

I've had trouble before with doubting our relationship, before our first visit I had similar thoughts, but I've told my girlfriend about it and she has forgiven me and we moved on, but now I'm having those feelings again and they are really strong.

I know I am a horrible person for acting like this and I'm feeling more and more like I am not cut out for a long distance relationship and that she doesn't deserve to waste her time on someone like me, but even if I do break up than I feel like I'm going to hurt her even more.

Even talking to her about it now before she comes over here is something I can't bring myself to do since it will make the money we spent on the tickets and the whole trip go to waste. What's making it even more difficult is the amount of involvement both our families have and my parents keep talking about even further trips for us to visit each other and just add on pressure, I feel like I can't breathe sometimes.

I really need some advice and I'll be grateful to anyone who is willing to read this post and give some helpful advice.
<bot>: Having doubts whether I can make it with my long distance gf; I don't want the selfish way out, but I feel like I will hurt her no matter what I do.