Advice sorry my mind is everywhere 😩

I having been in a real relationship since high school(2016) Right now I’m tried of being single. Everyone around me like close friends and family got someone except me.I’m ready to be in a serious one but my generation don’t take it serious. What can I do? And the person I want to be with clam he has a gf(but I haven’t seen no sign of that) and we been on and off since summer 2016 I miss him I always think that Its my fault I mess up and miss my chance What can I do? Im not the type to throw myself on a guy like other females do