This is Dr. David
what is your question?
you really should only be doing self breast exams once a month after your period.
you are young, so you normally have glands and fat lobules in your breast.
the photo looks like you are feeling something on the bottom of your left breast
you could be feeling a rib or a normal breast gland in that area
I would not stress about breast cancer in your case.
you are probably feeling a rib there.
floating ribs are the 11th and 12 ribs.
yes, a floating rib can be through to be a lump or mass in the breast if you are inexperienced in doing breast exams.
these ribs start in the back and wrap around to the front.
we are all build not 100% symmetric
so one rib may be different shape than the other rib
so you don't have to worry if you can't feel the floating ribs on the other side the same.
let me know if you have other questions.
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yes, they can be different sizes and thickness.
yes, this is a normal rib.
you don't have to worry about it.