Not being happy is a normal human reaction. It occurs when you realize that you have been repeatedly lied to. Only the fearful and prideful ( yes, prideful because they are afraid to look stupid or admit they were suckered) hide their feelings of being hurt. JWs are one of the most fearful, pride-filled and bigoted religions, so it's no wonder that they refuse to see the elephant in the room.
Just tell that you are sad to see so many Elderly ones dying off right and left. Tell them you were always told that you would never get old, but the WTBTS now writes articles about how to care for our "new generation" of elderly ones. A generation that you were told would never exist. After all, if YOU were to never get much older, then the same should have held true for your parents and grand-parents. Sadly, the WTBTS now writing WT and KM articles about the inevitable consequences of old age.
Tell everyone. Then tell them that it's very depressing to you, be honest. Step down from your position. You will be so much happier and you may cause others to think and face their Cog-diss. It sounds like you need to take the next step in your fade.
DD