Do I have OCD? I might I would just like to be sure.?

<.< I think I might have OCD...... Like I cannot have certain colors next to each other such as Red and.......... Blue Orange. its actually orange but i cant have it close to the other color I first typed. Also while I walk I have to step on every leave on the ground if I miss one I go all the way back and step on every leaf again while thinking the same thought, and when I eat M&M's or Skittles I have to eat my least favorite first two by two one on each side of my mouth but when i get to the green M&M's I eat one at a time on the left side of my mouth. I must touch certain things too, like my dog. I'll have to scratch her left ear with my right hand then her back with my left hand. I NEVER scratch her right ear because I don't like things on the right side of anything.. All my desk top items are on the left side in order that I most visit them. But the worst thing is if I mess anything up say this message I need to erase it and re-type it with no errors again and again until I get it right. This happens at school too I re-write everything like ten times. I re-wrote this six times >.> so I'm thinking I have OCD but I just want to be sure...