Feeling Stuck and Worried About What's Ahead

I'm still young, but it feels like time is slipping away. I'm not performing well in my studies and have taken gaps for various reasons, so I'm really lagging behind. I'm pursuing a degree that doesn't interest me, and I'm struggling with it-it feels like it's pointless. My lifestyle habits are declining, and I'm neglecting my salah. I'm scared that without a degree, I won't achieve anything, that I'll never get married, never find or receive love, that I won't earn enough, that I won't be able to establish a family or support my parents. I'm just afraid. I trust in Allah's plan for me. But I feel that my disobedience and neglect, both towards Allah and myself, mean I've already messed up. In this world, not everyone succeeds; some are bound to fall short, some end up as the ones who don't make it, and I fear that's my fate. I recognize all this, but I can't seem to change. When things are going okay, my mind sabotages it, distracting me or filling me with negative thoughts. It feels like I've already failed, and I'm lost on what to do next.