Credit cards?

I read that experian article that someone linked to earlier. I still kind of got a little confused (it happens every once in a while). I used to have 10 credit cards. I am now down to 8. I don't use half of them. EVER. I have read where, if you don't ever use some of your cards, TO cancel them. I cancelled two of them simply because they don't have those stores near where I live now. How would I use them? I would like to reduce my credit cards down to maybe 2 or 3. I don't know my Credit Score so will cancelling them be a negative? I mean half of them I don't even use anymore.

I assume my score is pretty good. My parents bought me a car but put it in my name to make it look like I bought it. My car insurance is in my name, and it's paid on time, every time. Every credit card bill is paid in full, on time, every time. Should I just go ahead and do a mass cancellation of the cards I don't want or just do it one at a time over a period of time?