Pain on left side of breast under armpit?

So every time I lie down on my left side it feels like something is bothering me there so I have to get up cause it hurts 🤔 if my bra is a little tight I have to take it off also cause it feels uncomfortable and I only feel pain when I’m laying down like something is bothering me inside there deep in my rib cage. I know it’s not the spleen cause the spleen is lower than that and it’s also very sensitive if I press on it. I also don’t feel lumps on my breast I feel like the pain is more deep inside 😣 Anyone ever had a pain like that?

Pic for reference