Need some help !

So im a 14 yr old virgin girl and don't plan on losing my virginity for years but I have some questions that i cant really talk to with my parents soooo Ima just list them and if you would list your answers in order that'd be great.

How much is a box of condoms?

Do you have to be 18 to buy them?

Are homemade dental dams safe enough to use? (Like cutting a condom into one)

If you finger a girl, and she has something but say you have no cuts or wounds in your finger, can you still get any std she may have?

Where would you even possibly buy flavored condoms at? (Weird question I know)

What age is too young to be having sex (in your opinion)