yes, very normal
Your boobs are sore because your still in puberty and they're STILL growing so they might be sore..ITS OK its normal for them to be that way! but also your boobs can be sore if you are but i would only worry about that if you are sexualy active
You haven't started puberty yet!
if you have entered puberty, your breasts will usually be sore from time to time
Some minor problems can be muscle stiffness, sore breasts (both occasionally) but nothing too serious.
Yes
Yes.
Yes. As breasts grow, it is normal for them to be tender or a bit sore.
you can experience many type of problem during puberty such as breasts develop and may turn sore Also you can get teenager spots. this depends all on what type of person you are some people reach puberty very early whereas some might take very long.
Sore breasts before period is normal. If you miss your period, take a test
it probaly is normal
For some women that is normal. And some never get sore breasts. It depends on the pregnancy and the women. If you are worried, talk to your doctor, but that is normal. The tenderness may come back also.