At 5% Interest rate you would have $197,053.74
At 10% you would have $1,127,901.32
8% yields a total of $543,718.66 Which would be a pretty safe bet if you invested in stock market index fund, such as one that tracks the S&P500. I would recommend a mutual fund over an ETF in this case because you are depositing $20 per week. But if it's an annual deposit you may want to use ETFs for some cost savings (assuming low cost trades).
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I knew it was around 200k and I was being conservative on the investment side. I was making the point that you don't need a lot to start saving for the future and it doesn't have to be high risk.
P.S. Cut up the credit cards