Everyone has felt stuck at some point in their life. It's part of being human. I think it normally happens when we stop listening to our inner voice, stop going after what we want, and stop challenging ourselves.
It’s easy to get stuck in specific patterns or habits as the routine of life just seems to settle in around you. Things somehow become automatic, expected, and mundane. Sometimes you can let this go on for years before getting to a place in life and wondering how you got there. You might get to a place where you don’t even fully recognize your life or yourself anymore.