Do you think I have autism or Asperger's?

It sounds more like you are just a quiet person, it isn't a disorder. Try joining a club or traveling, that way it may be easier for you to start conversations since you will have things to talk about. I am the same way, I just prefer being on my own and have never really had close friends. Going on study tours is fun since there is just a small group and you do a lot of interesting things.