People who understand personal fitness: I could only curl a 10 pound weight 75 times. Where does that place me?

23yo male, 233lbs, 6'3, 21% body fat (navy method), lightly active (almost exclusively cardio, I cycle rather than biking, I swim 1-3 times a week, and I do 10-13 thousand steps per day).

I just did bicep curls out of curiousity. I have never done real "strength training". 10lbs weight on my left (dominant) hand, I got 75 curls in before I physically could not do any more. That last one I had to use my whole body to complete the rep. The whole set took only a few minutes.

I want to drop some fat. I would like to do some strength training at the gym with weights but I am a bit intimidated— my main fear is that I will show up and completely exhaust myself inside of 20 minutes.

Based on this one assessment I did of myself, where does that place me? What should I consider trying if I want to start strength training?