Is it normal to feel this miserable?

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I'm 15 and having family issues. I feel alone even though I have friends. I hate being around people but I'm sad alone too. I think about suicide sometimes too (not that seriously though) and I always fake a smile. However, whenever I read my twitter and facebook feeds a lot of people say things like "no one knows what I'm going through" or "I fake a smile through life" and it makes me feel like my problems and feelings are normal and common. Should I get help or just try to get over it, even though I can't.
Thanks!