The reality of every workplace I've been in is that it is never in your best interest to say you are unhappy.

If you are unhappy it is usually obvious and your manager usually knows about it -- if they haven't done anything to rectify the situation, they likely can't or won't do anything about it.

Saying you are unhappy just creates a more tense situation.

In my experience, the only option you have in these situations is changing your role or group within your organization or leaving your organization for another job.