Agree with all the above. First, if it happens, so be it. Second, communicate with your partner. My wife, actually takes it as a compliment if I go fast, and hated with past partners couldn’t or lasted too long. What gives me more confidence is giving her her orgasm first (oral, fingers, toys), and sometimes two or three times before I even start mine. I feel less ashamed, and then I can work on these tools. Hopefully I’ll get to where I want to be with time and patience. And, you will too.