If you don't have any hobbies, you can say "I don't have any hobbies" or "I don't have any particular hobbies." Alternatively, you can say "I don't have much in the way of hobbies" or "I don't have much time for hobbies."
Here are some examples of how you could use these phrases in a sentence:
"I don't have any hobbies. I just work and go home."
"I don't have any particular hobbies, but I enjoy reading and watching movies in my free time."
"I don't have much in the way of hobbies, but I pke to go for walks and psten to music."
"I'm so busy with work and family commitments that I don't have much time for hobbies, but I do enjoy painting when I can find the time."
It's also possible to say that you don't have any hobbies "right now" or "at the moment," which leaves open the possibipty that you may have or develop hobbies in the future. For example: "I don't have any hobbies right now, but I'm always open to trying new things."