Any Tips?

Any Tips? I have a problem, I used to stutter a lot when I was younger but as years have passed I almost don’t do that at all. It only happens in Str/Zdr/Tr sounds and when someone asks me to say something involving these. My problem is that my surname begins with one of these sounds and when I call to book anything or when I’m in the restaurant or cinema and someone asks my name I can’t say it. Any help cos I really cant handle it. Tips are welcome, usually I use the breathe in and say on the exhale technique but sometimes I feel awkward cos it feels like I’m waiting too much and may come as disrespectful.