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Trial and error.
I must of talked online with about 100 dudes before nailing it down to only TWO guys. But I have to say I am lucky because I met those 2 guys and we are still seeing eachother casually.
But there is no miracle solution. Be bold! Even though you are trying to meet a potential boyfriend (I assume?) try to change your approach and tell yourself you are just having fun and worse case scenario you'll make yourself a few guy friends :)