For me, being stuck had to do with PTSD. I didn't realize it at the time, I just knew I was profoundly stuck and couldn't move forward with my life. I went to a therapist who recognized I was suffering from trauma and we had to work on past events to get unstuck in the present. I sure am glad he knew what my problem was and how to go about solving it, because I had no idea! I'm not stuck anymore, and it's wonderful.
I have also had depression and this feels very different to me. No energy, no motivation, not wanting to get out of bed, etc. Very different. For me being stuck due to trauma was quite different--I could have a lot of energy and be quite activated. There was some kind of terror or brick wall about moving forward even if I wanted to and was very motivated.