Tip: An issue that is serious to you is not always serious to everyone else. Threads placed in serious discussion are usually expected to be about matters that are important to more than one thing or one person. Examples:
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Education
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Protesting Funerals
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Hentai being banned (serious business)
See how there's a difference? Your life is important (and I'm sure other people care about it), but you might get a little heat for placing threads of this nature in serious discussion. But hey, we all screw up here and there and it's not that bad.
To answer your question
I'm in college now and I plan to become a doctor. Or at least that's what I tell myself. It's not all that easy though and you run into challenges. Here and there I wonder if I really want to be a doctor. I like the idea of helping people, being there for them, and the prestige and wealth that comes with being a doctor is also pretty intriguing. Despite all of that, sometimes I just want to say "Fuck it" and call it quits.
Really, I don't know what I truly want to be. I never really decided I wanted to be a doctor until I was actually accepted into college. And even then, I'm often wondering if it's the right path for me. I'm only aiming to be a doctor because it seems relatively enjoyable, I don't mind helping people, and the pay is pretty damn nice... but eh.. I don't know.
I guess in short I'm trying to convey a message that you're not alone. Not everyone knows what they want to do with life. Even I, who has plans laid out pertaining to be a doctor, don't know if that's what I'll stick with. But take your time. Some people don't know what they truly want to be until they're 40. Some people never find out.