I was in a similar situation when I was young. Now, I don’t think your child has suicidal thoughts because of not having friends, it’s probably about him having a stutter. Which is understandable, anyone here can tell you that. There is probably a battle in his mind every day about trying to reduce stutter and avoiding situations where he might stutter. I didn’t really have any friends when I was younger either, but it was mostly because I was quiet and afraid to speak because of my stutter. I know this because people were often keen on talking to me. I was very shameful of my stutter, so I usally didn’t talk much and didn’t make any friends. My suggestion to you is to tell him every day that he is a regular boy even thought he stutters. Tell him to speak freely and don’t think about his stutter. This will reduce anxiety and shift the focus from trying not to stutter to trying to communicate.