Whether or not your loan interest is deductable, your business plan doesn't make sense.
Unless you can invest in interest only tools, and the interest is greater than what your lender gives you, you are taking a risk on the principal.
Your principal risk, if you are investing in stocks, is dependent on knowledge, experience and ability to time your purchases.
But since you probably have little knowledge and no experience, you're no better off an investor than anyone else, ie no better an idiot than most anyone else.
Don't invest money in individual stocks you can't afford to lose, and never invest or trade with 100% borrowed money unless there is no chance of being wrong...investing on margin is risky enough.
So if you make so much money and its not a big deal to risk it, then start saving, and the market will be around when you've built your investment fund. Not to mention it doesn't sound like you've been making that money very long, increasing the overall risk of your approach.