50 exp is, like, one quest, my guy. And not the tag-along stuff with Eric, stuff like finding a recipe for a potion that gives you big titties. You're not going to get a lot of experience from fighting because fighting isn't the main focus. Expanding your repertoire of interactions is.
The grindiest aspect is the relationship points, but even that gets easier as you unlock more and more stuff you can do with each character, worth more and more relationship points.
I'm not going to tell you to go make your own game if you don't like it. I hate that line, it's trite bullshit. But my brother in Christ, you came to the porn game forum, why are you surprised to find you have to play?
And if your fingers are cramping, maybe try a lighter grip.