Yeah. Your bars (handlebars) are attached to your head set and head tube by your stem. The stem should have some bolts on it you can undo. Once they're gone you can remove the bar. Then it's just a matter of getting a new one that's the right diameter and sticking it back in.

Bikes are great. Anybody can fix a bike and there are tons of replacement parts all over. If this repair is too daunting you could always take it to your local bike shop to ask for advice, or, if you live in a cool town, there might be a "bike kitchen" around, which is usually a volunteer-run org that helps folks fix their own bikes and often has used parts bins for cheap replacements as well.

Best of luck!