If you have a second job, you might feel embarrassed by it. However, if you're open about your work, you'll be able to spend your time as efficiently as possible without stressing over others finding out about your side gig.
Chelsea Fagan, writing on The Financial Diet, puts it in perspective:
But feeling embarrassment over any of this is dumb, and profoundly unproductive. We all need to do what we must to get by, and sometimes that might mean obfuscating your financial realities to leverage more money from an employer or a client, to avoid being exploited and becoming trapped in a cycle of "your time isn't worth anything because no one will pay for it." That's just the reality of getting a foothold in many industries, and nothing to be embarrassed about.
By being open about your side gig, you make scheduling a social life or family events a lot easier. When everyone knows you have another job or jobs you're committed to, they're often more understanding of your schedule.
Keep in mind that your employer may not be pleased to find out that you have a second job, so there are still times when it's best to keep it quiet. But as long as you're legally allowed to do side work and are able to deliver results at your main job, owning your side gig will help you be more focused on all your work.