Politicians are professional liars because people are professional dunces, they want to be lied to. Many often prefer a beautiful lie than a ugly truth.
The truth is that you can trust few individuals and almost everyone know very little about the truth of this world, most trust is merely the mutual avoidance of undesirable consequences or the mutual desire for benefit. It matters a lot in a democratic society how you vote, who is in power and what policies get set, because things like Supreme Court Justices, laws, legislation and many other policies are still very relevant You will not get what you want but if you were expecting that you are blind to the desires of others.
Your politicians will fail you, and you will fail your society by doing nothing about it and not educating yourself and disenfranchising yourself by choice, then you have failed your society. There are many individual who want to disenfranchise the society and wish to perpetuate the lie that you are powerless, that the forces arrayed against you are unassailable, that you are merely a victim of society. Should you choose to believe this lie, that is your prerogative, it's certainly a safe lie, until the real abuses trickle down to you.
The truth is that one is never powerless, although we might feel it, the enemies against are only men and their delusions and absurdities, and although their resources might dwarf ours and that if you are steadfast and determined, the possibility for success exists.