I'm on salary, but I do feel similar pressure as well. Even though I'm being paid more than decently I'm still looking for additional gigs, but what is hardest

I'm on salary, but I do feel similar pressure as well. Even though I'm being paid more than decently I'm still looking for additional gigs, but what is hardest on me is the feeling that I'm loosing time and a lot of money if I do not manage my side projects everyday and I do not grow constantly even though my main side thing is not designed to bring me any money I feel really bad when I'm slacking.