where do u stand for God??

If im a stranger walking past you can i tell ur a christian? What if i stop and talk to you ? Do you bring up your faith? Do u ask about mine? I was walking down the halls of my college wondering do they see me as just another student or do they  wonder what is different? I bring up this subject because i was able to share my faith with one of my professors and it was a very scary but amazing thing . I found out they were a christian also. We talked about our roles in our churches and then parted ways. I have included my entire school in my prayers from then on.........please respond and let me know ur thoughts!!!