Nobody wants meh and people are starting to get the wrong idea ...?

Boys :| .. The only boyfriend i have ever had was in first school, ya know just a silly childrens thing, but now people are starting to notice and are thinking im lez or something. Boys have asked me out but i say no becaus i cant find the right one. I like the look of a few boys but im not popular enough to go out with them let alone getting the courage of asking them out ! I really need help with confidence and get a few tips to get them crawling all over me. THANKYOUH ! x p.s , Im still in school by the way .... :)