People who are professionals know to take even things that seem trivial to the person in need seriously.
I think it's natural for parents to say you're overreacting -- in the sense of "oh, well, *I* was 'normal' as a teenager," etc, etc. They also... they sort of put themselves into denial when bad things happen to their kids. There does, though, come a point at which they have to realize that it isn't melodrama, and that it's real. And then they'll want to help.
In terms of who to talk to, that's for you to decide based on your comfort level. Perhaps it's better to talk with a professional who you don't know, because they can look at the situation more objectively, and becaues it's their job to help. But maybe someone you know would be able to help in ways that someone just meeting you for the first time can't. It's up to what you feel comfortable doing, though. Do talk to someone, though.
A work of art is an invitation to love.