I feel like I'm going nowhere in life
Is there a reason why you think you're going nowhere in life?
I've been working on the same software
If you feel stuck on a project you should ask your coworkers for help. Being stuck on a software doesn't mean you're going nowhere.
Maybe but how do I convince other people that I'm not going nowhere in life?
Well they might not even be thinking about this or judging you.  You can ask for help or ask to be switched to a different project. Just be honest with your boss.