(I apologize for the following but I can't stop my brain, even though I'm pretty tired of my smartass thoughts myself by now.)
I want to tell you another truth - that it CAN be personality trait but it also can be a sign of your specific kind of fuckuppery. And this can be true for both. Girl who likes to kiss 24/7 may have serious abandonment issues and guy who hates to cuddle just isn't able to let people close to him mentally as well. Point being: we are all fucked up one way or another and sometimes it will be expressed with hugging/not-hugging.
And also it might not be about fuckuppery but just different stages one is in his/her life. If you are insecure and vulnerable, you may prefer more physical contact. But if you are just out of tough relationship you might enjoy being alone and you don't want closeness at all.
And finally I get to answering OP: why would you think it's weird in the first place? Just like some want to have children, others don't, some like BDSM, others same sex partners and there are always some weird "orientations" you would be happier WITHOUT knowing about. Then it couldn't surprise anyone that there are also people like you who like closeness as you do and that's actually pretty awesome you live life the way it makes you feel content. Hugs or no hugs.