If there were ways of doing this without investing, trading, spending time or risk being a victim, i guess everybody would be doing it, right? You're not talking about making 2% profit in 1 year, you're talking about 1000% in 2 months...

In your case, i think you'll have to take a very easy decission:
Either:

1) confess to your parents what you've done
2) take a loan, pay your parents back, get an IRL job to pay back your loan.