its not lame to let your mom do it. my mum does all mine, she even comes in the room with me lol
it could be gum disease if it bleeds when you brush it - keep brushing it though even if it bleeds, including the gum, instead of just brushing the tooth itself. i used tog et that when i was younger and didnt brush my teeth enough. its nothing serious, it just is a pain in the arse because it can hurt when you brush it until it goes. i think you should go to the dentists anyway though and they can tell you what to do to get it better