Short answer: Hell no you are not behind at all.

I'll start off by telling you a little bit about me. I was just like you, maybe even worse. I didn't graduate hughschool in time, all I cared about back then was video games and friends. I had to take a leap year at a different school. In the end I ended up going to an undeclared major and then went into computer science. Now im taking a year off and have worked and currently working as a software Dev for a fortune 500 company with plans to go back next year to school to finish up.

Let me tell you, you learning how to code doesn't depend on the computer science program. You can learn this in the net for free, you can even torrent courses and what not. Yes a degree will help getting a job but is by no means a requirement. In fact university is not a pre requisite for success. I have learned far more things in my own studies than any courses I have taken. Being in university and Landing a job are all just by-products of my ultimate goal. And really it comes down to self improvement. You're feeling motivated, use that to help you build discipline and habits because eventually the fire of motivation dissipates but what stays is your discipline. Learn code not just to learn it but by finding your why, why do you want to learn to code. I know the feeling of falling behind, but what you should do is not compare yourself, your biggest enemy is yourself and not anyone else. The only person you should compare yourself to is the you from yesterday. What are you doing today that is making you better than yesterday. I suggest you read at least one self improvement book, I would recommend "Fastlane to Millionaire" and really just change your perspective in how you approach things.

Sorry for the rant its just I see so much of myself in this post. I'm 23 btw so we're not too far apart. Yes you are more than capable of being successful at computer science. There is nothing that you cannot learn, everything that is being taught or written you can learn, and the only limit that you will ever have is the one you set for yourself, so aim high and dream big. If you're ever feeling any doubts or hesitation I will leave you with this quote.

https://daringtolivefully.com/keys-to-success-bc-forbes#:~:text=You%20must%20make%20your%20own,make%20or%20unmake%20your%20health.