Is it normal that I don't have close friends and that I'm solitary?

Who cares what's normal, but your situation is quite common.

However I'd advise that you force your self to work on the social aspect and have relationships - friends, colleagues, enemies is all good as long as you invest some time in that. One good outcome is in high school you can have sex with your peers - other young people, something that is illegal in the USA to do when you become older.