Apparently it reasonable to say you give yourself colds, as the virus doesn't travel in aerosol droplets, unlike true influenza, so is nearly always transferred from a surface to your face via your own hands. And 2-6 colds is normal.
When some one in the office has a cold I always go mad with the alcohol gel and baby wipes, and try hard not to pick my nose or rub my eyes (I have stopped sucking my thumb now). I also try to keep hold of the cordless phone so the unclean have to use the desk handset.
In return I also do the same when I have a cold.
I think I get 2 or 3 a year. I try to avoid decongestants, unless I can't sleep or breath, and then prefer a spray to a systemic one.
This year I got one just in time for my birthday. BOOO.