I am a Sedimentary Rock

You'll have to excuse my love of Geography on this one.

I'm going on a trip to the states soon. It's with school, so lots of people will be there. Last week, we were signing up for buses and of course, one group of friends decided to go on bus #2, and another group of friends decided to go on bus #3. You wouldn't think it would be so difficult to choose a damn bus, it's only a 4 hour ride, but I got really emotional over it. I thought my decision would dictate how the entire trip went: me choosing between friends and always missing out on one thing or another. Sometimes I wish I had just one set of close friends who I can default to, but that's not me. It's never been me. I can't even spend a lunch hour in the same room for more than 10 minutes. I have to make my rounds.

I've always prided myself on being well-rounded, but sometimes that makes me more vulnerable to getting hurt, or rather, hurting myself. My personality is made up of little bits and pieces of my friends and people I admire, and when I meet someone, I always like to find something we have in common. It just makes the transition from strangers to acquaintances a little more interesting, you know? Mind you, when it comes time to being myself, I have no idea what that means. I feel like I have to be different around different people because of social circumstances, and that confuses me a lot when those different groups of people are all together. The sad thing is, that when I graduate at the end of this year, I'm going to miss having this problem.

So as for the trip, I suppose I'll just have the best time I can with whoever I'm with, and I'll hear everyone else's inside jokes later back at the hotel. I can't say it's not going to make me sad, but what else can I do?

PS
-I never liked ven diagrams.