If it helps any, you’re not the first to have feelings like this toward the end of your undergraduate life. You’re not alone.
My advice for the moment would be to focus on making a strong finish in school. Yes, you need/want to start thinking about your future, but you don’t want to get this far only to stumble at the finish line. Don’t tack on a full-time or demanding job unless it’s absolutely necessary. June is going to show up a lot faster than you think it will and you have a lot of research, writing, and revision to go.