This may not apply to your situation but...
Here's what I did:
- started a home-based computer business near start of Year 11
- put off advertising for fear of failing my final years of high school due to lack of time from the business sucking it up
- made it through high school and got into uni
- started with a double degree, and basically wasted 4 months as I hated what I was being taught... though I suppose socially those months were good
- now doing the other part of my planned double degree (i.e. commerce now)
Here's what I WISH did:
- started my path to becoming an entrepreneur a lot earlier on in life
- advertised and really pushed my business and applied good time management
- passed high school and deferred uni for a year
- stayed at home while continuing to build my business/es
- earn enough to qualify for centrelink (government payments for students, something I couldn't get as my parents combined income was over the limit)
- went to uni the following year with successful business/es, and regular cashflow which would have majorly boosted my confidence and ego right about now
That's all
I would suggest looking at how much time you can committ to running a business, then workout what you're passionate about, and find a business that will both fit in with your time and be something you're passionate about.
And just do it, you're likely to make mistakes and have times where you think what the hell you're doing... but stick with it, learn from your mistakes and it'll take you a long way.
cheers
nathan