I young and just started biking & I wear one ALL THE TIME. It's not about looking cool or anything. I just rather be safe than sorry.

The positives of a helmet definitely out-weighs the negitives.

Another thing, I think the #1 reason why people don't wear one is because they think they will feel uncomfortable and and hot. Someone mentioned about large vents in helmets nowadays, and it is true. I got used to my helmet just after a week of riding. After it's on my head for 3 minutes, I don't even feel it anymore.

Do it for yourself, do it for the people you love.