It's 100% possible!
I've been trying to make money online since I was 13. I started off doing GPT sites where you basically get paid a little bit of money for doing surveys. I still remember getting a $20 check in the mail from one of these sites like it was yesterday...that might not sound like a lot of money, but to a 14 year old that's fuckin incredible.
If anything it let me know that this 'online thing' actually works. No matter how much you fail keep going. Use your mini-successes for confidence to keep going at it everyday.
From there, I started blogging and made my first $100 online. Then, I started creating my own products and made my first $1,000 online.
It all comes down to insane hustle, being a sponge, trying to learn as much as you can, and just never giving up. Find something you like and if it gets you results, keep doing it.
I'm 19 now and am still grinding away and am loving it. I'm focusing 100% of my efforts on product creation and email marketing and it's giving me great results. You can try that out and see if you like it.
I've also made money ranking videos on YouTube so that's another route you can go down.
I've been on this forum for close to 5-6 years now and I've learned a shit ton from it. I recommend you just look at as many threads as you can and take as MUCH action as you can. If you need more help, I shot a video the other day where I break down how I make money.
You can watch it here on YouTube. Nothing for sale.
Anyways, hope this helped! I've been where you're at, and hopefully this gave you that burst of motivation and confidence you need to tackle it head on.
Good luck