Is this a curse? Being young, pretty and charismatic?

Guys who meet me for the first time, they're like 'Omg, you're so cool!' They're like all over me because I'm really friendly, I talk always with a smile on my face, make jokes and when I'm meeting someone for the first time, I NEVER make them feel like we're talking for the first time, as I'm already too busy making jokes and stuff. It kinda bothers me the fact that they try to hit on me thinking I'm being flirtatious. But that's just me, and I wouldn't wanna change my personality either. I dress quite conservatively and this two time I met with two guys at two different times, and both of them were like 'Omg. You have a seducing smile!' or 'Wow. That look you just gave me is so seductive'. For crying out loud, I don't even do this on purpose. I'm naturally a very nice person and I guess I'm very charismatic and when guys try to hit on me that I have zero interest with, it gets very awkward. What do I do?