I cant start conversations or continue conversations because im scared i’ll stutter

I cant start conversations or continue conversations because im scared i’ll stutter Whenever im talking to somebody or going up to someone to speak with them, i find it so difficult to get the confidence to just talk because im scared that ill stutter and ruin the whole thing. And if i try to just ‘spit it out’ or ‘force it out’, it is definitely going to be a stutter. This effects me in so many ways because it can be hard to ask a teacher for something, or respond to what somebody tells you, etc. How do I simply get the confidence to not overthink and just be relaxed when i talk to somebody?