Male breast cancer is rare, but one out of every 150 cases of breast cancer involves a man, usually in men over 60 years old. Although a painless breast lump is the most common sign, most breast lumps in men are benign (non-cancerous) and are related to some other cause. So in your case it would be really very unlikely that cancer is the problem. The biopsy will clarify, it is possible that some infection is present.
Pain could be due to any number of things. As you have been told by me and by the Cleveland Clinic nurse, breast cancer isn't on the list at your age.
Thanks for the info. Just out of curosoity, I have been having some pain on my left side, (in my shoulder and arm and on the left side of my ribs) could this be related to the lump in anyway or be a result of cancer spreading (although i don't think it is) The pain is dull and kinda ache and only started about 5 days ago.
male breast cancer is nearly unheard of at your age. Ultrasound for a lump like that doesn't tell anything you didn't know: ultrasound really only can tell if it's a cyst, and cysts are as rare as cancer in a 19 year old male. The biopsy will give an answer, and it's safe to say it will turn out ok. Squeezing could conceivably caused infection, but it's doubtful. As with females, being able to produce fluid with enough squeezing is common; the only kind of discharge that we really worry about is that which occurs without squeezing; and even then, only if it's bloody or watery, for the most part.