GIRLS: Have you ever gotten hit on by an older man?

Well this has happened to me several times, where I'm at the cash register, walking through stores, etc. and then some guy either gives a creepy smile, stares, or starts to flirt with me. (BTW I'm 17!?) It has happened several times in front of my mother, and she just smiles or gives me that person a dirty look ( but it's embarrasing for me lol) The other day I was riding on the Metrolink by myself (I do dress like I'm 19/20) and some guy in his forties starts talking to me and he gives me his phone # and email and says he want to see me again. He grabbed my hand several times... and then he RUBS HIS HAND ON MY LEG! I'm not the kind of girl to be straightforward and say "you're making me uncomfortable" but this was way out of line. I was alone, and I got off that train and just walk away. What really creeped me out was a similar thing had happened on a plane like 6 months ago with an older man, and I was alone then too. Hahaha I've made it a habit to go out with my brother at all times now. I was wondering if any girls out there had have similar expereinces/ incidents and any tips to deal with it. I just freeze when things like that happen, and I really just want to say no, but then again I don't want to be mean or cause a commotion? My parents don't know anything about this.