I don't think I really want a relationship
Why doesn't that appeal to you?
It is not a problem, I just want to spend some time alone
It's your life and your freedom. Not everyone needs to be in a relationship, and if being single is what makes you happy then more power to you. You don't need to force yourself into something you don't like.
That is why I don't want to be in a relationship, it feels forced.
You're right that it can feel that way at times, so you should feel free to just live a life free from romance for a while.  If the mood strikes you differently later on, or if you meet someone special, you can always start up a relationship when you're ready.