Can I become successful in the future?

Hello, my name is Rowan and I recently turned 20 but I have gone through on and off chronic depression since the age of 13; this has affected my interests and attainment in my subjects through school and college, which has spoilt my great interest in Maths, Science, and Geography. I am however at university and am studying English Language and History but this has come through a very low period of depression where even on holiday I started to extremely dislike even waking for the next day. My holiday destination is somewhere I have always dreamed of going to- the province of Quebec- visiting the very juxtaposed cities of Montreal and Quebec and the serene beauty of the St Lawrence river. My university offers a year abroad in Canada so I do have the chance to visit, which is really great since I want to reconnect with my relatives there as well.
The main concern for me is that I have been in a slump for many of these years (essentially wasting my teenage years) and underperforming in academia and neglecting my hobbies such as Go-karting, or video gaming. Today I feel unhealthy, quite uneducated, and most importantly unfulfilled. I am also behind on my degree due to my mental state and I've simply had enough with the direction my life is going in.
So what do I want to do? Well firstly, finishing this degree is certainly important to me as it'll demonstrate I can do it, but really I want to explore myself and my interests. I would love to revisit the sciences and maths and perhaps make a career out of those by doing qualifications in those subjects whilst or after doing my degree. I also want to get in shape and consider doing athletics in the next few years- joining a gym last week and going back to swimming again are some ways in which I feel I can prepare for this. Being physically fit is also something I feel can help learn better and would aid in overcoming my depression. One of my other goals is to finally learn a musical instrument- I have considered the guitar before but I would love to learn the drums right now. I have dyspraxia, which affects my co-ordination and memory and I certainly feel that learning this will aid me in improving my issues with memory and co-ordination.
So really what am I looking for? Well, I want to know if you have any advice for achieving my goals. Or if I should and can pursue them at my age. My grades aren't representative of what I can do and I really feel that I have the potential to do it but I feel limited by doing it later in my life.