I generally agree with what others have said so I won’t give much prescriptive advice, but I will say that yes, the combination of little experience, no degree, and needing an H-1b are probably working against you and set the bar higher for recruiters to get back to you. No degree in particular tends to shut doors at big companies in my experience, especially for full time roles.

That said… dude, relax. You’re 20. No one has job experience at 20. If building stuff gets you excited, then build stuff. It will make you happier, and having stuff to show off on GitHub tends to be a good investment in your career.