Anyone else feel so overwhelmed that they can't seem to focus on doing ONE task because you're thinking about doing the rest of the stuff you need to do?

For example, I really want to start on a project that will help me with my research internship but I can't seem to sit down because I'm constantly worried about my thesis, other projects, and research/internship applications. So I end up just going back and forth until the day ends and it doesn't feel like I've accomplished anything.