I hope you've taken in some of the great advice already posted in this thread. I'd like to just add that with any venture into a new business you should treat it as a 'side hustle' until it gains traction. Stick to a job to put food on the table and keep a roof over your head, it will trickle fund your side hustle while you work on it and there can be other side hustles which can add to that trickle and speed things up. Know your goal, do what you need to until you hit milestones and keep going. Do NOT expect it to be a success overnight, you will be setting yourself up to fail as there's no amount of positive well wishes to counter your own negativity from ultra-high expectations (i blame the so-called gurus out there, i'm starting to classify them as a niche myself lol - there's no doubt a school they all graduate from, ever noticed how they network with each other all the time juggling people desperate to get a piece of financial freedom? Mentee to Mentors overnight >.<).
At the very least, you have taken action and are learning things as you go which those gurus out there can never ever teach you. Lots of people never get to the action stage due to procrastination and other commitments, so well-done! Drop-shipping is very saturated but why it so is because of the low cost barrier to entry, and my suggestion is also to take a step back from reckless advertising spend as i can see it eating up any, if not all or more of your profits. Even if you make 10k in revenue but spend 15k in ads and expenses in the same month does not make it a success. I also don't believe in spending too high on advertising, it's not sustainable you want to start with advertising but work your way to being mostly organic, maximise your profits. I'd rather make 10k in revenue and have 1-2k cost and expenses.
In this day and age, guess who the winners are regardless if businesses succeed or fail? That's right.... the people you pay to advertise with - FB, Google, etc. (Google and FB only make money via advertising, that's their entire business model).
Research more to get a better return from your ads, look into more organic traffic a free exposure. Instead of losing money to advertising, why not consider losing money to keep customer base and grow it (free gift for social proof of purchase, extra discount for referrals etc).
Study your competition, see what they are doing well and what doesn't work for them. Take the good from others other sources and learn from their mistakes too.
Don't give up, maybe take a step back to re-evaluate but definitely don't give up. People will be buying and selling until the end of time, Amazon won't dominate - as they grow they will be kept in place. The powers that be don't like monopolies and the spirit of competition always wins in the end.
I wish you luck!