Is normal to not be able to have a relationship?

I’m in my early 20s. Never had proper relationships. When i was 15 i had one but it lasted a month. It was kinda awkward you know kids love. Now i was seeing one girl who had a crush on me for a long time. I really liked her. Things were looking well but then she turned me down. I feel like i am not able to have a relationship. I am okay being on my own so i am not looking for it like constantly. I think relationships are not my think and better stay out of it. I dont know what would i do in one anyway.

Is normal to not be able to have a relationship?
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