Many of my YA story ideas tend to be more tame. My teenage years were not full of experiences with drugs, alcohol, and sex, so in my story ideas I like to explore the very real and high-stakes drama that can occur in the lives of teens who do not have that particular brand of conflict.
With that said, if the story calls for darker themes, I won't shy away from it.
I'm similar and different to you - my teenage years were also not full of drugs, alcohol and sex, so perhaps I look into those things in my work because they're an experience very outside my own! That said, I hear you: things that might seem less drama packed can very much feel like they have high stakes. Exams, for example.