Weird fat-like bump between my breasts

There's little bump on the middle of the area between my breasts, it's been there awhile but it was so small and didn't hurt so I didn't pay any attention to it. But now anytime I'm not wearing a bra and my boots make the slightest movement it's like a shock of pain. I can't lay on my stomach or press anything to my chest without it being super painful. You can hardly see the bump and i have bad camera quality so a photo would be no use.

If I touch the area around it it also hurts, and it'll get this burning sensation randomly throughout the day. Anyone have any idea on what it could be? It's driving me nuts and I don't wanna spend money that my family doesnt have going to the doctors and it's just nothing.

The bump feels like it's tissue or fat, not like pus