Any tips for lasting longer?

I’m sure others deal with this as well, but it is very frustrating. I met a girl who is wayyy out of my league and I’m very attracted to her, to the point where I can’t control myself at all. We haven’t had sex yet, but I still climax very quickly to handjobs etc with her, and haven’t had this issue as much with other girls in the past. I think it just means I feel something real for her, but don’t want my sexual issues to ruin a chance I have at a relationship. I’ve tried some of the courses on here, but nothing has really helped. Any tips from anyone who’s been in a similar situation? Appreciate all advice