Maybe tell them that you have a stutter disorder. In that escenario you won´t be wasting energy trying to hide it. Instead you can focus on being you. I can asure you that in that escenario your chances of success will improve. If that is not posible because of the shame associated then try to aproach them as natural as you can. Don´t force the conversation. Let it happen natural. Be patient. Just do you. Probably you will stutter anyway but don´t give it much importance. There will be people that laugh or reject you for sure but there will be other that don´t. There are some good people around the world that won´t judge you because you block. Who knows maybe you know another stammer and you will find a common topic. Go for it.