I'm assuming you're not rich, so the first thing is: get a job. Start to work and saving what you can. It's important to keep moving to keep the inertia going and not stall in a place where you're completely broke.

What job? Whatever. Do Uber. Do McDonalds. Look for something. Get experience. Forget about dreams. They are useless and overrated. In the process of doing jobs, be curious. Spend the energy you would spend on dreaming into observing. You will find quickly what you like and what you hate. If the job is not for you get out and find another one. Go towards things you like, feel comfortable and feel capable doing.

While doing it ask yourself "What's next?", followed by "How?". I'm working in car shop cleaning and organizing, what's next? Fixing cars looks interesting, maybe I should try that? How? I'll try to learn from these guys and do courses. What's next? I may get a job fixing cars. Great, I know how to fix cars, they hired me and I like it. What's next? Maybe having my own shop? How? You get the idea.

Keep a diary. It's hard because it feels ridiculous. Like a teenager rambling about feelings. I still hate doing it to this day, and I'm 50. But it gives me insights about things I'm doing, because it helps you to see patterns in your behaviour. Like quitting when things were too hard to do because the noise in my head was unbearable and I had this depression that would not quit and I felt I as an alien around people and maybe I should do therapy and HOLY FUCK I'm autistic and that's why EVERYTHING was so hard. The knowledge you may gain doing a diary is unvaluable. Do it the way you feel comfortable (or less painful) to do - physical notebook, computer, tablet, whatever.

In short: keep on moving, be curious, be self-reflective.

That's all what I have for now, good luck!