Becoming a superhuman

You tell your older brother and he doesn't believe you at first until you show him how fast you are. He agrees to not tell anyone and you continue to learn about being a superhero. You feel as if you're ready to go out and finally fight people. Save others, be an awesome hero. As you go out for the first time, you have made a pretty shabby looking suit and your name will be Mirage. You don't know what to do at first but soon a person is getting robbed, what do you do?