I think we have a cultural tendency to think of success along the lines of achievement and status. we look for the indicators of success as being flashy titles, cushy salaries, awards and accolades, material luxuries, and social status (we also have a tendency to tie success to one's career, which doesn't need to be the case). These things are superficial indicators of privilege and power, however, and may not actually be linked to a successful life.
I'm more of the mindset that to be successful is to do with your life that which you feel you were meant to do, a sense of having achieved with your efforts the thing which you felt was most important for you to achieve. This can look a lot of ways, but broadly I would say that it looks like integrating your passions, competencies, capabilities, and broader lifestyle in a way that supports the pursuit of your goalsāwhether your goals are professional, personal, artistic, spiritual, whatever. And if you've really done this, positioned yourself such that you wake up each morning with a purpose or a sense of being on the path towards purpose, then getting there will feel as good as you hoped.
Now if you get to this point which you envisioned would be the landmark of having reached success and it doesn't feel like you're dedicating your efforts meaningfully towards something which brings you flourishing, then maybe this isn't your success. Does that mean you've failed? Not necessarily, it just means you're still on the path to finding your success, and that journey and that struggle can be rewarding in and of themselves. Don't pin your success to looking a certain way, don't limit yourself to only having one modality for achieving success, and don't be afraid to move your target if it's not serving you. Get to that point of being able to pour your whole self into something and you're gonna feel great.