It's real easy to give advice but quite another thing to put if to practice.but here's my two cents. Flirt being a little flirtatious can go a long way just don't get carried away could you might come off as obnoxious . there's nothing wrong with a little flirting or even a line. it's kind of like a knock at the door. if they don't respond well then move on . you definitely don't want to get involved with somebody that snooty stuck up or conceited . there's plenty of nice girls around. Also don't always go for the pretty ones there too pretty that maybe part of the reason you get nervous around them. don't overlook the ones that are maybe not as pretty but funny or have good personalities or just nice . beauty can fade but a good personality never will . Lastly just don't sweat it its really no big deal to get rejected.believe me I got shot down plenty of times before I married my beautiful wife. Good luck