Need to Vent Real Quick

I just need to vent about myself for a little bit. I feel I was a bit naive for the 2008 year. I watch kids before and after school and did not think that I earned enough money to pay self employment taxes, well turns out I did make enough and my taxes are hefty! I am soooo mad at myself! I now know that if I continue what I am doing I am going to have to set aside money to pay for the taxes for 2009 as well as pay them quarterly! UGH, I am wondering if this is worth the hassle!