What can i do?

when ever i meet a guy and we hang out for a while and we become really good friends, they end up wanting more. but i just want a platonic friendship, is there somthing i do or don't ?i feel bad , have agreed once with one it didn't work out and i lost contact cause i couldn't bear the emberacment, so i stop picking his calls , even deleted his number. i love having guys as friends, it happens when i was still at school and now at work as well, i try to ignore it tinkin they ar jokin but i can feel the strain between us.................. please help