You really should see a doctor. It could be cancer, could be cysts.
If the half hockey pucks are at the bottom front of each breast, there is a smooth ridge there in many women's breasts. It doesn't feel like bone, more like cartilage. From another website -- "Often there's a ridge of fat at the bottom of the breast—the inframammary ridge. This ridge is perfectly normal, and is the result of the fact that we walk upright and our breasts fold over themselves."
There are also many kinds of breast lumps that are benign. The fact that yours have never changed makes them sound like one of those two categories (the smooth-ridge thing or the non-cancerous kind of lump.)
If you really had cancer, being frozen with fear would just give it more time to grow, when cancer (of all illnesses) is one where treating it sooner is much better than later. And if you don't have it, having worry as constant companion is for no reason, and is probably pretty crummy for your health since stress causes cortisol to raise, and that's no fun for the body in other ways. If someone else kept you from getting medical analysis about an issue, that's such a human rights violation that it is considered illegal in a lot of states. Don't do it to yourself. Go get the answer.
Hi. First. I want to mention something really serious. I also have a lot of fear of health and doctors. Why, I don't know. BUT, we have to get over that. We need to stay on top of our health. I found a primary care doctor that I know and trust and told her I was anxious She understood and has taken good care of me in a gentle way. As you get older, this is really more and more important. My insurance requires me to have a physical annually and blood work and IF I skip? It's a big financial charge that makes my husband grumpy. I do it. Now? I'm glad as I'm in the habit. My health has changed as I've gotten older and it's really more and more important to monitor things so you can stop anything negative health wise or catch anything early. That is my plea to you to not allow fear to stop you from proper care. A gynecological appointment is in order for you. These doctors are usually particularly kind, I've found. I had to find a new one and got a recommendation of my friend. Love this doctor. You need a breast exam and a pelvic exam if you haven't had one. (have you had kids yet?)
As to your lumps. I would not be overly worried. They have been there a long time (not new) and indicate that you just have lumpy breasts. Some women just do. Since they have been there since childhood, very unlikely to be anything to worry about. Changes would be more concerning. But a doctor can explain that to you. I did have a sizable lump (bigger than a golf ball) and it was a cyst. These are quite common as well. Harmless.
So, get checked out. But I would not worry.