I was in the same boat, Not Emo. Unfortunately for me, I started having issues at 13 or a bit earlier, then a few suicidal episodes made me talk to my parents and they rejected the idea of anything being wrong so I've been silent since. Finally was diagnosed with bipolar at 21 as I could take myself to a professional and I can tell you, it's really not worth delaying it unless you know the reaction from telling your parents will make things *much* worse. Every medical professional I saw leading up to my diagnosis asked me why I left it so late as I've had obvious symptoms for so long.

But I'm guessing from your family history they aren't the type to say it's not real etc? Just say how you've been feeling and you're trying to be responsible for your health so would like to have a check with a professional to see if you can nip it in the butt earlier so if something is up, it's not a concern as much in a the future when it could have a bigger impact. I'm pretty sure if you show you are serious and want to be honest with them, they'll help you get to and set up an appointment with a psychiatrist. Good luck! I know talking to parents can be tough. *hugs*