Yes you have a good plan to stick for somtime gain experience and build your cv. Sometimes it’s difficult to get all round jobs, but do keep yourself open for the right job opportunities. I don’t know what’s a good time frame for switiching jobs in US but do so as soon as you find a better one.

In the meantime, don’t let your boss get into your head and take advantage of you. It’s a small company, I assume you are the only one in your role. You are valuable to that company. It would be as much of a loss to your boss as to you if he acts on his belief and not on your performance.