Nothing makes me happy

I'm 18M, and I've come to the realisation that nothing makes me happy. I do not see myself as an intellectual, athlete, musician, someone who likes making things, and so on. I don't like stumbling through academic ideas, exercise makes me sore and I'm yet to find the supposed dopamine it releases, music never stuck, and anything involving making (woodworking, cooking, baking, and so on) never stuck either. Nothing interests me, and I've never displayed a natural affinity for anything. I do, however, find some joy in helping people. That makes me happy, but I feel like it's not enough anymore. There isn't anything I do for myself. I don't wish to end things here. If I've too broadly categorised hobbies, if there are yet more to explore, I'd love to know.