What do you do in this situation?

Last Wednesday I went into a restaurant with my resume to try and find a job because in the window there was a "help needed" sign. When I went in the manager asked me if I was busy that evening because he had just fired someone and he really needed someone to work the evening shift. I felt kind of on the spot so I just did it. I worked for about 4 hours and i got $35 in tips. I never got payed for the actual shift.. Also, I don't think they're going to keep me although he said he was going to hire me, but so far, they have been pretty shifty. While I was working he told me not to tell anyone that I was working around alcohol because I am only 17 and I guess 17 year olds aren't supposed to serve or be around alcohol, he was also drinking wine on the job. I never filled out any tax papers or any forms at all. I feel that I was a little used so what do I do?