Russian is the language I will be speaking to the customers at work as well as my coworkers.
Does it mean something to you to be able to speak it?
Yes, everyone is going to think I learnt it from a mental patient
I don't think that would be very fair to them. It's never appropriate to speak to someone in a language they don't speak themselves. It can make other feel uncomfortable not knowing what you are saying.
New language, new culture. It's good to stretch comfort zones. I absolutely love it.
Unless the people around you are also speaking Russian that seems silly. Why would you speak a language that's not being understood.