I don't miss being 18. There is a lot of pressure to figure out your life in a hurry.

Sorry if this is redundant to what you've read, but talking to the right counselor can be a huge relief. (I wouldn't recommend school counselors though) Lots of people feel a certain shame in doing so, but it's actually a brave act to get help. Parents tend to take it personally when you seek help, ofte blaming themselves but they come around in time. It's hard not to worry what others think, but the payoff is huge.

Hope things get better for you!