My mom and sister are pretty large on top and both got their period early. You are definitely going through puberty, but when your period will arrive is still a guess. Breast development is usually determined by genetics. Look at your mom, grandmoms, and any sisters or aunts you may have. You will look like them more than you look like your friends.
Most girls continue growing breasts for a year or two after they start menstruating.
I am only 13 and not sexually active. I haven't been to a gyn yet. Yes, definitely talk to mom. A yeast infection is a very common form of vaginal infection. It is important to see a doctor the first time you have a yeast infection to make sure you get the correct diagnosis.