feeling lost at the gym

i was feeling really down today after a session with one of my clients. she's been working out for months and i thought we were making real progress, but then she told me she feels like nothing has changed. it got to me more than i expected. i've been married for five years now and we've never had kids. sometimes i feel like i'm stuck in this cycle of workouts and clients with no real connection outside the gym. tonight, after my shift ended, i found myself texting an old friend from college who was into bdsm play. we hadn't talked in years but it felt good to vent about how things are now. does anyone else ever feel this way? is it normal to wonder if you've missed out on something bigger than just being a trainer?