I, myself have OCD. I started using Paxil a few years back, but it made me pretty violent, so I got off of that and got onto Zoloft, but then went off, because I wanted to try an experiment. Alas, it worked. I haven't been on any pills for over 2 months, and I don't have my OCD anymore, but the lingering effects of concentrating on intriguing subjects (I think that's just called 'interest' :p) is still here. People with OCD tend to go for perfection, since that is what their mind is pretty much telling them; "Do this, or fail miserably!" That's how it felt for me, anyway...
I would lock, and unlock my door about 50 times in a row sometimes, and switch on and off certain electric appliances until I felt at ease (this would go to 100 or more). I once took a step back for every 5 steps forward in a Target store once, and ended up taking 55 steps back. Yeah, that sucked. Over time, we learn to cope with such *evil*, and begin to put our obsessions to better use. For me, it's usually network troubleshooting for my local internet company.
Aside from OCD, I am/was agoraphobic, which is a profound fear of the world. I didn't leave my house for a whole year, once. Not even walking past my mailbox. This also explains why I was homeschooled. Add allergies to this, and SAD (social anxiety disorder), and you have a volatile mix.
After finally realizing I didn't need to be perfect, I made myself 'fit' with the world, only to come to the conclusion that the world is stupid. Very st00p1d. I am now pursuing a career in game development at Brown U so that I can sit in a dark corner of an office all day and munch on pizzaria pretzel combos all the while sipping on wine; this means I can indulge on my OCD and agoraphobic tendencies.
Damn you, world....