What should I do about my Sternum pains?

I am 15 and my sternum is I guess bruised but its a dull pain that hurts every time I move the wrong way or stretch my arms a little far. Last year I injured wrestling and the trainer told me to rest a week its just bruised. well I still have pains and the trainer told me I re-bruised it when I hurt it again 3 other times. I read up collarbone injuries can also cause sternum pains. In 7th grade I broke my collarbone also so I thinking about going to the doctor and telling her this all but I would like to know something that could help before I go.