There are about 7,000 languages in the world. Your native tongue is the first ever knowledge given to you when you were born. You learn it effortlessly like it's the most natural thing in the world. And if you have no means to learning new languages, or just never had the motivation before, then you might be under the 40% of the population that are monolingual or only speaks one language, or perhaps you have the capacity to learn two languages, so now you're bilingual. But it is very rare that a person has both the means, the capacity, and the motivation to be a polyglot. In fact, did you know that less than one percent of the world are polyglots?
Polyglots are those of the population that has such a high degree of language proficiency that they can speak more than 5 vernaculars fluently. Compared to most that still needs dictionaries when traveling, these people could converse flawlessly in a different dialect that they don't have trouble ordering breakfast at a local diner. So, how can you become a polyglot so you could finally rid yourself of awkward hand signals that don't make sense to foreigners? The best advice would be to practice the language you want as often as you can. This would help you memorize and get used to the language. Second, unlike with most things, don't multitask. Only take up one language at a time. The third is that you should be sure you're doing it for the right reasons. Although having bragging rights is nice, it's still not an excuse and could make your learning experience terrible. So be sure you think it through. But if you've already decided and you're a thousand percent ready to learn, then go right ahead and enjoy the journey!