Business principles is big I see, although my problem is finding what to revolve a business around. Maybe join a sales training job for the time being? Please help.. :/ I'm in it for the long run, I'm patient and persistent as long as the outcome will be positive.
I would tell my 18-year-old self to spend more time identifying what I enjoy doing. In your case, I suggest you do the same. Identify what make you feel fulfilled? Then answer the questions, how does it align with what you would like to do or how you see yourself 2 years, 5 years or 10 years from now?
Don't get caught up doing what everyone else is doing, instead spend time exploring your different interests, dream BIG and don't limit yourself.