If you start with the idea that you won't last long, you won't last. Thinking about this with concern about your abilities is a sure way to end much sooner than you would like. Biologically, this is completely understandable, insecurity leads to anxiety, your body understands when you are worried.
There is absolutely nothing to be ashamed of and you will understand that just talking openly about it solves half of all problems by itself.
Allow to men to stay hard for more than 1 round.