What does it meen when u have a lump in your best that thay can feel but can not see in a ultrasound she keeper going over and over it and still cant?

Breast MRI: Should be considered. See radiologyinfo.Org and look up breast imaging and breast mri.

Likely normal: Lumps in the 20-25 year age range are very unlikely to be cancer in the absence of genetic or family history, and even then unlikely at that age. This is most commonly focal normal glandular tissue, with a normal ultrasound at an accredited facility.