Finish too quickly with a specific partner. What do I do?

Hi all, just wanted to ask some advice. For some background, I’ve had a lot of sexual partners in the past. Some were great, some were not so good, some I loved, and others I saw casually. So I’ve had a whole different amount of feelings for the people I’ve been with. Without exception, it’s taken me 20-30 minutes to finish, if at all.

I recently started seeing someone new casually, and I’ve been finding myself finish in a few minutes each time. My partner has been flattered so far, but I’m sure finishing in a minute will get old pretty quickly. What do I do? I don’t see anything obviously different about this situation that would cause this much of a difference in me. Thanks in advance for the help!