I need to solve a riddle but I can't figure it out. Apparently love/happiness/purpose is wrong! "Every single person that exists has had some of me and wanted some of me, but I am different for everyone. Sometimes I will never be found and sometimes I can't be found. I can be as hard to find as a needle in a haystack, but once I am found, I am as plain as the nose on your face. What am I?"

Question

I need to solve a riddle but I can't figure it out. Apparently love/happiness/purpose is wrong! "Every single person that exists has had some of me and wanted some of me, but I am different for everyone. Sometimes I will never be found and sometimes I can't be found. I can be as hard to find as a needle in a haystack, but once I am found, I am as plain as the nose on your face. What am I?" 
Help please.

time ???

I'll post that as another guess, but I only get 1 more after that. I hope this works, because while it fits most of it, it still might not fit because of the "plain as the nose on your face" part. Plz try to come up with more everybody.

Ugh. Still haven't figured it out, but I got close. I guessed "A secret", and it fit all the craiteria, but it wasn't what he was looking for. Has anybody heard something like this before?

Only because you want more "guesses" how about "air?"

air? idk

entertainment?????

I agree with either economyst or SraJMcGin