Like you I'm worried that I'll be single for the rest of my life, so I joined a dating agency. Met someone I think I like but my guts feelings told me this wasn't right! Now I have realised that I have to feel confident, love myself and then the right person will come my way. I waited 3 years between my last BF and meeting my H.
I still hope to R, unfortunately as each day goes by I can see my window of hope slowly closing!
You are a great person, only at the moment don't think about the future because it's not here yet. Think about living in the present, enjoy what you have done today, now, and do the same tomorrow.