I'm extremely shy and an introvert and traveling has worked out for me. I have never had a problem with the work environment, as long as you're a team player and a hard worker, they will not care. Trust me, I have extended at every assignment, except for one which was my choice. My first assignment ever in traveling I made friends quickly and had people to hang out with on off days. I will be honest though, my next assignment it took me a good 2 months before some of the other staff opened up to me, or maybe it was me opening up to them..not sure. I felt like I had no friends and was so isolated
I'd go to the movies by myself, go out to eat by myself and it was just a sad and lonely time. Eventually I made it through. So if you happen to get to an assignment where maybe you're the only traveler or you're having a hard time, remember it's not always like that.
I've made a lot of friends and if you travel long enough, you'll find that traveling is a small world into itself. It's funny how you'll meet someone who worked with so and so in a different city. If you meet other travelers ask for their number right away. It doesn't always work out, but I've found that you at least have someone to grab lunch or a drink with. You have to make an effort. Some people do things like meet up and that seems to help.
I've learned to come out of my shell a bit and be more open to meeting new people and I've learned to be happy with just being by myself. Overall I've had good and bad days but I do not regret traveling. The only thing I regret is not traveling to more places, which I am going to do this year. Best of luck to you.