I feel so lonely i dont know what to do</3?

im in highschool and i am quite pretty and have a good personality but no one seems to want to get to know me, i have my own group of friends but they all go off with their boyfriends now and i dont have a boyfriend i dont know why i cant get one because i have tried so hard on my looks and attiude, and even in online chat no one talks to me and even if i start the convo off its lke simple answers that they couldnt careless what should i do? :(