Hi gdiocarez, I cannot speak to your abilities because I haven't seen your code, but $20 an hour is absolutely achievable. I would strongly recommend that you do also take some courses to improve on your English. Good, unambiguous communication is crucial for remote work (I am remote from the rest of my team and bad communication costs so much time and effort). Improving your English will also help the perception your potential clients will have on you and your work.
So much this. It's not just important to be okay at communication. I've had coworkers in the U.S. that were immigrants and it was absolutely painful to work with them to the point, where we actively just excluded them. We just found human cron-job tasks and relegated them to those tasks (unfairly, but better than laying them off). In things like software, where there are many many abstract concepts being thrown around, not being able to communicate will get one quickly out the door.
Good advice. One thing I do know: "people skills" are as important in software as they are almost any place else. And in case it offers any perspective at all to the OP, I am working my way up from a disadvantaged place in US society, and I'm getting paid $20/hr to intern in my first programming job. I expect that to be $30/hr by the end of the year, then on from there. FWIW.
Good luck!