I dropped Spanish which was the only language offered during my high school years. I regret it, and now I’m embarrassed to start learning as a uni-aged guy. I want to learn Mandarin because then I would know English and Mandarin which would cover like 50% of the populations speaking abilities.
Basically I just feel like a dumb American and being a Marxist I need to know another language.
If necessity is not a concern then you should only learn a language if you want to, not because you feel like you have to. Learning a language is an incredibly long and arduous process so the will and the desire to learn it has to be there.