Does it hurt to get hit with a paintball?
This is the first question asked new players usually ask about the sport. Getting hit by a paintball typically "stings" or "smarts" a little, especially if shot inside of 20 feet and directly on your skin. Typically, this will result in a small welt or bruise. The best comparison for what it feels like is snapping yourself with a rubber band. Because of this, paintball is recommended for 12+.
If this bothers you, you can wear extra protective padding, such as knee pads, elbow pads, gloves, chest protectors, and neck protectors. And, of course, approved paintball masks to protect your eyes and face are mandatory safety gear.