I was at this point not so long ago, but really, there is no going back. You are past the point of ignorance being bliss, and deep down you know that.
What to do? Stop listening to other people. Most people, even in this community, are far too self-confident in their opinions of this food or that food. Also, recreating what our ancestors ate so long ago is only possible to people living in the wild. Period. Simply try to eat things that, according to our current knowledge, are mostly good for you, and cut out things that are in any way bad for you. I know, it sounds simple.
I would suggest that you educate yourself by reading real scientific studies and learning how to read those studies properly (if this floats your boat). Be absolutely OK with eating unhealthy. As a matter of fact, in order to prevent a complex from forming in your mind, you can have cheat days (I do one every 2 months) when you gorge on whatever you want. After those days I always know why I am doing my diet.
If you ask someone a question and they give you a dogmatic answer without specifying actual DATA and real world evidence along with a sound logical interpretation, their two cents is not worth a single cent as far as I am concerned.
Lastly, trust your body when dealing with whole foods. It doesn't matter how great they say sweet potatoes might be... my stomach still doesn't like them. With knowledge you will gain more self-confidence in your own judgements. The voices of people proselytizing this or that will fade away, leaving a serene quiet inside your mind.
Remember, we are here only for a short while, so it is pretty silly to stress over just about anything in our lives. Just let go and enjoy one moment after another, and don't forget that other people whom we care about are the only thing giving our lives meaning.