Affiliate Marketing Secrets

I’m having a difficult time figuring out what I’m good at. I’ve taken some strengths quizzes and they seem to give me a decent idea, but they are also somewhat general and if you know what the Barnum Effect is that’s probably playing somewhat of a role in taking those quizzes too.
I’m a 20 year-old college student so I should really start to figure this out as I need to start applying for internships and what not soon. I may also be a bit modest, so that could also be making this difficult. But I mostly think I just haven’t found the right niche. I do have a job right now, but I wouldn’t say it emphasizes or brings out my strengths as much as it does for other co-workers.
Where should I start in this investigation?

Admittedly I’ve no experience in business at all, but the idea of having your own business – being your own boss – sounds an appealing one. How do you come up with a decent idea, though? Is it all about looking for a niche market or doing something established already? Are there any surefire prospects or is it all hit and miss? Anything worth trying?
Thanks.