I haven't had any issues making friends. I currently have only one really good friend but that's cause I drift away from people when I get busy so that's on me and not the stutter. Relationship wise I use to see my stutter as a barrier because I didn't want to be uncomfortable. I choose just to join a dating app, that's how I found my boyfriend. I stuttered a ton but I was upfront about my stutter in my profile and chatting so he wouldn't be surprised. At first I thought I would be rejected for my stutter but the people I accepted for dates didn't mind and asked for more dates. Try some coffee dates it's less pressure and short, which might be easier for introverted people.