I would stop giving out the number - it's also a security risk, it makes you vulnerable and as you mentioned, sad.
Wait until someone gives YOU his number.
The more you search - people will feel it. If you are more reluctant and appear strong and happy - the reaction will be different.
Example:
As long as I was not sure of myself and had complexes (when young), people used to mock and bully me - aura weak.
Once I started Judo and became good at it, nobody ever did this again - aura strong.
It was just automatic.
Why don't you start something that gives you pleasure? There are so many possibilities. From chess-clubs to paragliding. And don't forget - most men are not worth it. Wait for the one.
Good that you are here. I send you a big hug.
