Most guys are so irritating! (help! Please!!)

Okay, soo a few days ago, I was walking down the street and I was looking for a restaurant and this guy walks up to me and starts talking to me and stuff. He asked me if I was looking for something and I asked him if he knew where that restaurant was, he says no, but starts talking to me some more which is fine, I just tell him I'm a kid and we stop talking. Then I start walking down the street and he starts following me a little bit... I cross the street and go up. He stops following me, GOOD! Then about a few minutes after this predicament a guy in a truck starts blowing kisses at me saying, "Hey, baby, come over here." Trying to be "cute." And I'm just like okay, Natty, just walk away... quickly...
Then the next day I'm talking on the phone to my friend Kris and another fucking guy starts talking to me! All of these guys are OLD! Like 30! I told this guy how old I was and he still asks for my email and for whatever reason I give him my email... And I regret it now, but I did in my stupidity. Omg... And he's emailed me twice in the past 2 days... What do I do? Help me against these horrible people!!!

Natty.