Is it normal to be annoyed at miniscule things and feel like things aren't real

i've been getting this weird feeling that i get sometimes when i look at people that somehow nothing is real as we know it. i feel like i can see everyone's bit maps like in a computer and it freaks me out. and recently human noises have been driving me insane,just the noise of lots of people talking annoys me and i cannot concentrate. but the opposite happens when i am alone, i need a little bit of backround noise to fully concentrate on whatever it is i need to do, so i usually have a song stuck in my head.

i MIGHT be OCD and i used to be diagnosed with Asperger's when i was young because of my poor social skills.