Have a hole below my breasts. i searched a condition called pectus excavatum that looks very similar to mine but is that in between chest? what is it?

Yes: It is genetic and nothing to worry. If severe it can be surgically corrected but it is major surgery. If you do nothing you will be fine.

Pectus excavatum....: Pectus excavatum is a defect in the sternum, the bone in the middle of your chest. In this defect, the sternum looks "caved in"-the sternum is lower into the chest. This occurs midline. Not sure this is what you are describing so it would be a good idea for your doctor to examine you to diagnose your condition and treat if needed. Good luck!