How do you Exude confidence even when you're a newbie in business?

I had a business idea in clothing and I started 10 years ago but my stock finished next year and I couldnt create new merchandise. I lost my business certificate early 2018 cus I couldnt renew it, at the time I was working as a Librarian in a nursing training college. Only thing I kept was my business phone numbers cus I knew that was where my passion was.

Well, 2026, I re-created some merchandise and its almost sold out again but I've had some people willing to invest in me, I think they think its cus time might be running out on me, Im 32 now. Im about to pick a physical location its the first time for me and Im so excited and I know I will never go back to broke unworking me again. But, I just feel so low on energy. I wish I could get back to 27 year old me who was so energetic, curious and always studying more about the apparel business and landscape. I know I have the brains to make it, I've already seen myself loosing interest in the people and things that waste my time. I guess im also low on energy because I know life as an elite business man is not basic, ordinary or 'always available'.
So I guess what I want to ask is are you in the business community and what advice can you give me to keep my head up and ride this wave like I deserve it and bring some change to my community?
How do you Exude confidence even when you're a newbie in business?
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