Dating tips for a sercetly shy guy?

hey Im a gay male in chicago I moved here not to long ago im from the carolinas and im use to just meeting guys from off line but now that I live in the big city up north I run into guys that hit on me in public and send sgins they like me and I dont know how to react whats wrong with me lol ?what are some was to say I like someone but to where if Im turn down i wont feel bad? Or to send a sign bac to someone that I like them also ?