breast pain

i know i should go to the doctor regarding these things but i just wanna know if others experience it.

my left breast is slightly bigger than the other one, it’s always been like that but one thing i’ve noticed is that in my right one (the smaller one) it gets so much more tender than the big one. and i’ve really tried to feel if there are any lumps out of the ordinary, something off and i haven’t felt anything so far but the only thing i felt is it feels harder. idk how to explain it but the bigger one is more squishy and soft while the small one feels harder not like rock hard but enough to feel the difference) and i get little random pains on it and it’s weird.

so basically, my small boob gets more pain around my period, and feels a little bit harder than my big one. again, i haven’t felt any lumps or at least i don’t think i have. tbh i’m not ever sure what i’m supposed to feel but i know i haven’t found anything drastic to be noticeable.

so my question is, is it normal for one breast to be more sensitive??? and tbh i’m scared to get a mammogram but i know it’s necessary to make sure there’s nothing to be super scared of.