I suspect I have a quite mild case of OCD because I don't get that anxious if I don't carry out my compulsions. For me it's more about a feeling. It just doesn't feel right when I don't do it. It's like an itch I need to scratch and I can't really focus until I've done so. Examples of compulsions:

1. I arrange and organise things. I put things in the "right" angles until they look right.
2. I even things out, touch things the same amount of times and/or with the same amount of pressure, avoid stepping on things I've categorised as "uneven" etc. Examples of things I've categorised as uneven: certain cracks in the sidewalk, things breaking the "normal pattern" on the street, thresholds, certain stones and leaves on the ground etc.
3. I count steps and certain things I do.
4. I read and reread things and I write and rewrite things over and over again to avoid mistakes or because what I've read or written doesn't feel right the first time.
5. Perfectionism.
6. I check and recheck certain things before I go to bed and before leaving the house to avoid accidents.
7. Not sure if this is a compulsion or a tic (if you know the answer please let me know) but I sometimes get a weird feeling in my fingers which I can only get rid of by pressing my fingers against for example my desk. I get the same feeling in/on my nose which I can only get rid of by pressing my nose against my upper lip and hold it there for a little while.

Things like that.