Whether or not language is a folkway depends on how language is being used. A folkway is a behavior that does not have legal sanctions in society but is usually considered poor manners. Cursing may be an example of language as a folkway.
A common reward for a folkway is social acceptance. A folkway is the normal behavior people follow because of tradition or convenience.
The difference between a custom and a folkway is that a custom is more formal. A custom is something that is expected. A folkway may be common, but it is not something that one feels is expected or mandatory.
moving towards heterosexuality is knowing an opposite sex for teenagers
Yes. Yes it is.
A folkway is a social idea shared by most people; they are also called morals. The reward for following folkways is social acceptance.
Social acceptance
folkway
There is more sexualities out there than only heterosexuality, homosexuality and bisexuality. For example, pansexuality and asexuality
No, this is called heterosexuality.
Heterosexuality nor Homosexuality is wrong. It's only a preference of what gender you find attractive and I think there's nothing wrong with either way you choose.
Being loud in public is annoying.