” check LR turn signal” Light

Ok…..so my check turn signal light just came on….and sure enough, the turn signal does not work. The brake light and the running light run on the same bulb as the turn signal….but the bulb is only working for the running light, and not the turn signal or brake light. Any suggestions? Could it still be the bulb even though it works for the running light? I dont know anything about cars and I cannot afford a mechanic…..please help