You know, they don't. Only you know what your going through, sure maybe a few people have experienced it. Although, there are people who say they do. You probably think they don't, and I hate to break it, there's a very high percent chance they don't. Maybe they say the do, for popularity, making people think they care. Fake sympathy. Maybe they are trying to make you feel better, but honestly for me, it makes it worse. There's always some problem in my head, always thinking somethings going to go wrong, it's not a good feeling, you know. Everyone has problems. That's just how it works, and it's hard to find someone who gets it, and even if you know someone, you probably don't want to tell them. Tell them. You're going to regret it if you don't. But even what I said earlier, there's at least one person who can help, you're going to find them someday, and it's going to get better, you probably already know this person. It's hard to trust your gut sometimes, but sometimes it's better to take a shot than live with your problem forever.
But what do I know,right? Even though you probably don't trust a random stranger,(makes sense) there is someone out there, you just have to find them, and you will. :)