Lump in my breast

So I found a lump yesterday in my breast and tho Iv had clogged milk ducts before this doesn’t feel like one. This feels hard ovel large hurts some but has a feeling like as if to much blood flow kinda burning sensation but not in a painful way it’s up rite under/above my nipple (I have very small breast equal to when a little girl starts where her 1st real bra) I lift my arm and can see the lump. I have a family history of breast cancer on my moms side (just about everyone has had it) but no one will tell me how they found it like what made them get it checked. On my sperm doners side there’s been a few cancer and some members just had cysts and again no one will tell me any info about any of it. I have an apt on wed but I’m scared. More of the tests than the diagnosis