Sos advice plsxxxxxxxx?

I just find out that my best friend long time ago has been engaged and now has a baby shes at my age 18 and still goes to highschool (our highschool is +1 year dont know why) anw now im feeling sad not because im jelous im very happy bout her but its just im 18 and i never had a boyfriend only dated once at 12 and i have a bit to blame ,yself bec i didnt gave attention but i always loved a guy and now i can see that i totally waste my life feeling feelings for some1 who doesnt love me + i didnt have teenage dating and stuff ... im mizerable ...its like my whole life is over i know that i will end up alone for waiting the guy i love but what can i do im not that type which is easygoing and i hardly go to clubs i need help