Dear Wendy,
It saddens me when I read your post! And the answers is no you are not being over sensitive and you should trust what your guts is telling you!

When people feel the need to criticise others so heavily it is usually an issue they have within theirselves.
He clearly has issues as he feels the need to project his negativity on to you and make you feel bad about yourself so he feels good about himself.

I would make it very clear to him that you will not be treated, spoken to or bullied in such away and you will not allow him to make you feel lacking in your self worth/esteem.

If he does not life you up then you need to speak to him and ask him in a calm way why he feels the need to put you down and if he cannot say anything nice then don’t say anything to you at all. If he can’t respect your wishes then I would question if he is the right man for you?
Critical men will turn into controlling me and you do not want to be in a controlling relationship full stop as that will lead to other issues!!!

I do hope you can make him understand how he is making you feel and if he loves you so much he will see how much he is upsetting/hurting you and stop!

Good luck and please know how great you are and don’t let anyone else tell you better!!!