Is it possible that I have OCD?

I'm starting to think I have OCD. If I'm watching TV or playing video games, I always make sure the volume is either set to an even number, or a multiple of 5. I hate seeing things asymmetrical. I hate seeing things with no particular layout or organizational style. On my phone and Desktop I organize things into folders so they only take up as much space as either 2 rows or 2 columns (Rows for my IPhone, and then columns for my computer). I'm good in Math and Science, but I hate rounding numbers unless they are irrational. I also check to see if I have all of my stuff in my backpack repeatedly before I leave for school (for homework, books, etc… ). Do I have OCD?

It sure sounds like it.

OCD is an anxiety disorder.
There are medications to reduce anxiety, but the most important treatment is your cognitive self-statements and self-awareness. Medications are only a partial masking of symptoms, and neither cure nor correct the underlying causes of your anxiety.

You are moving towards OCD, and you do not want to lose your self-control. Start seeing a psychologist and getting on top of these tendencies before they envelop your life.

It does sound like it, OCD is an anxiety disorder so it won't send you crazy
try different ways to calm and relax yourself

If it were only for the volume i would say it's just a possibility, since a good deal of the population feels uncomfortable then. But from you other examples i would say you probably do have it. Also, OCD makes it more likely for the host to be above average intelligence, possibly cotributing to your talent in Math and Science. What i'm trying to say is than OCD isn't always that bad. I have it too and i've grown oused to it, and i made most of teh parts I wouldnt want incompatible with my personality, such as the paranoia and the flamboyant anxiety. But if you really are bothered by this you might want to find medication of some way to suppress it.