Can i still pick my life up at 21 and achieve what I want to do? (read description) ?

When I was 18-19 I was in college doing a fitness instructing course I left feeling depressed after how I felt when I was kinda feeling bullied. I kinda drifted between jobs not truly satisfied with what I was doing I remember getting invited for a Halloween party in 2018 I believe where it was at this nightclub with my mate Djing I remember just walking off and going home after feeling isolated. In 2019 I started this college course where it was the same course except it had the personal training part I showed them my certificate for fitness instructing so I didn't need to be there for first part. I was told to comeback in January 2020 I completely forgot and there was a period of me doing nothing I got a couple more jobs at warehouses, then in September I went back to college determined I was going to complete it but I was like 4 weeks behind, I got a job in dfs factory in November and then they let me go in January this year. And I just feel like although I know I've been in work I didn't properly make use of my time, i was working out more back then too but I've kinda fallen back into abit of a slope, I still want to continue my goals like find a traineeship or an online course whilst working a part time job but I can't help to think I've left everything to late and I should already have it all now at my age. I have slept with a few women when I was 19-20 and looking back on it I would've stopped myself, I still feel like I have alot still to prove to myself