Hey aspirant

Dont feel low. Its never too late to start over. As you've realized that you've wasted a few years in nothing and you want to correct your mistakes, so start from today.

Concept building takes time and devotion. Try to make notes as much as you can, since written stuff gets into your brain easily. Then, assign tasks for each day, as per your preferences, and then associate rewards with the completion of those tasks.

Alongside, keep your aim steady in your brain, that you can definitely achieve it, even now.

Hope this helps you

All the best