worried about mental health

Delta is not my real name it's actually just because my name begins with D and delta is for D in the phonetic alphabet which goes to show my shame on this subject I have always picked at scabs and even more embarrasingly so my nose as long as I can remember maybe going to back to when i was even 3-5 I am now eighteen (and a female). I have scars all over my body although since i was lucky enough to not suffer with ackney, never my face. I also suffer from nosebleeds but only ever from one of my nostrals and usually in the winter. Every scab i have ever had i have picked at it until it could literally no longer be picked sometimes i don't even realise i am doing it, i seem to go in to a sort of trance and only ever come from it when it starts to hurt. I also have picked several moles on my arm away. I have always thought i was just a kid, people and kids pick at scabs and such but when my boyfriend (who i later dumped) and some collegues asked about these scars i decided to maybe look it up on the net and found this and several other information sites about the problem. I am now a bit worried about my mental health and i am wondering what underlying mental problems this could be a sympton off. I am more worried because i don't suffer from anythign that i have found to be a usual sympton of this like low self esteem or abuse. Like on paper my family is perfect but i don't even really know them and i love them but visiting is just going through the motions, same with my boyfriend who i have ended up spliting up simply because i was bored with pretending. I don't think my image is particularly ugly or fat i am just simply average. I don't have OCD i don't feel the need to do anything else compulsivly like tidy or wash my hands. I have friends who i am close with but as they're all at uni i don't get to see them very much and yet i don't miss them. I spend a lot of time on the computer watching shows (normally sci-fi or supernatural) and also on forum sites playing games, using photoshop and writing scripts. Infact i probably lied earlier i am not even really worried i am more curious as to what this could mean. I know i am not normal as being in my head is like being very detatched and i often wonder if people think how i do....the best way to describe it is if any of you have seen dexter that's pretty much how i think. I don't get people and many of their emotions or habbits. I don't understand why people get upset over cheating when it's a primal urge, i don't ever feel lust after anyone, i never care if people talk about me behind my back and i think funerals are a waste of money. Not what most people would deem to be normal thoughts. I'm not emocionless by any means. I do get upset and i do feel happy, i would do anything for my friends and i have cared for over 160 birds from chicks and would never wish harm on anyone. please does anyone feel the same? what could be wrong with me?