I'm pretty introverted and like to spend time to myself and not stress too much over relationships.
This is one thing you'd need to focus on in preparation, I think.
It will be very difficult to do if you can't make friends with people as you travel. Whether they're other travellers, who you travel alongside for a while, or they're locals who you get to know who help you out.
I've quite a few friends who have travelled abroad, either a lot or a little, and one of the most important things they seem to rely on while doing it is having new friends to help them.