I'm good at selling stuff online, what kind of job suits me?

I'm 26 years old just graduated college with a bachelor in criminal justice. Was going to join the NYPD but got rejected twice. I have now have no directions in life and don't know what else I want to do with my life. I currently work part-time and make around $16,000 per year before tax. I don't know what I can do with a major in criminal justice. I don't want to do paralegal or become a lawyer. I just wanted to become a police office but since that's not happening this bachelor degree is useless to me now...However, I am good at selling stuff online such as ebay and amazon and etc etc what kind of job should I look for? I always had a plan in starting my own e-commerce business and opening up an online store but I know where I'm standing and I know that's not going to happen now, maybe in 5 - 10 years but not now. NOW I need to grow up and find a job and make some real money ($40k/year). Thank you all for your advices and opinions.