It's not that there are words missing, it's that you are lacking in imagination: you only allow yourself to think in concepts that you have words for.

E.g., in Indonesian there are two forms of “we”: “kita”, that includes the person being spoken to, and “kami”, that excludes the person being spoken to. In my native language, Danish, there is only one form (“vi”) but I have never felt that I need more words to express “we”. Yet, when I see the Indonesian feature it seems immediately useful and I start wondering why that possibility of expression has never evolved in the Danish (or English) language.

You would probably want to read up on the Sapir-Whorf hypothesis — e.g., http://linguistlist.org/ask-ling/sapir.cfm