To all the successful entrepreneurs, how did you overcome the self doubt?

As of right now i’m living in a constant fear & self-doubt that my future entrepreneur endeavours are going to go in shambles. I’m 19 and live in Australia. Throughout my whole life growing up I felt as I have had this burden on me to be successful as I’m the oldest of 7. I feel it is my duty to be successful no matter what. I started a boilmaker (Welding) apprenticeship when I was 17 and quickly learnt over the year that it was simply not for me and ventured into other jobs. Becoming an entrepreneur and having my own business didn’t really factor into my mind until I was mid 18 and started to take the thoughts seriously. I began researching while jumping job to job to ensure money was still coming through and dipping into online business models, that had little to no success until I found a business model that worked for me which was Car detailing. I enjoy it and I was earning enough to get by, honestly earnt more in a week than i did at any job i’ve done and I saw the potential in where I could take this. I’m also really wanting to launch a clothing brand for car enthusiasts in the near future but as of recently since the work has died down and I have been relying on car detailing only for near 2 months now, Self doubt thoughts are getting to me and always seem to linger in the back of my mind. “What if I stuck to my apprenticeship?” “What does my family think?” “What if it doesn’t work out?”. Those are just some of the few hundred self doubt thoughts I have and it really tears me down sometimes. I really don’t want to work a full time job in construction or any job for that matter, I always feel judged for that as well, I tend to brush that off but again, something that effects me and I don’t understand why? Doing my own thing is what seems to drive me and I want to be successful in doing that but how do I overcome this constant fear, self doubt & the judgement?

Thanks