21 Years Old, And Feeling a Lump Over My Coler Bone

I have that I was notice a lump on my around my coller bone, it you go two inces to the left from my right nipple and then up till you get to the coler bone, that is where it is. I thoaught I feel something, a month or two ago, but it felt the same on the other side of my body. Today, the lump feels sore somewhat, I can feel it on the inside, almost like mild sting. I am going to the doctor, but, I am really worried, that it may be something. Just wanted to get an idea what it could or what it sounds like, and what are the odds I will be ok if it is something. I am only 21 years old.