Akrasia doesn't necessarily mean you're incapable of studying everything. It could just mean that you e.g. spend all your time studying languages when you should be working.

Also, three languages isn't that much if you have the right background: I speak Finnish because I live in Finland, Swedish because I had Swedish-speaking relatives and went to a Swedish-speaking elementary school, and English because that was the language most of the most interesting entertainment was in. I don't remember really needing to actively study any of them: I just picked them up via childhood immersion, not unlike many other people from the same background. (Well, I did keep asking my parents about the English terms in video games and such early on, but that never felt like studying.)