Get a trainer. A good one will help you understand the progression and the different lifts and such. And will also keep you motivated when you are figuring it out. You don’t have to keep them forever but just to get started for a couple months can be great motivation in my experience.
In my experience, strength training is about gradually increasing the weight, start with something like 2.5 lbs, then move to 5 lbs as you go. But only add weight once you can do your sets and reps with proper form. Form really matters, bad form is how you get injured.
The other things that make a big difference: eating enough (you need more calories to lift more) and getting enough sleep as well as rest between workouts.
Like every other exercise, it's a question of building a habit.
Could well be, the other thing could be that weight training is quite a bit more boring than running - I rely on music to get me into a lifting zone.
Weights becomes fun when you see the progress in your physique and in the weight you can lift going up and feel in that things that were hard are now easier.
As someone else suggested, a trainer can really help as can doing a a simple compound lift based programme like Strong Lifts 5x5 as it’s simple and you make good gains pretty quickly.