Neither my current T nor my ex-T seemed fake, I feel they are both very genuine and even a bit vulnerable too, and very present with me in the room. I think there are two possibilities in your situation, one is that your T is not very present and genuine with you, or the other is that your doubt relates to your 'stuff', perhaps you are finding it hard to trust and feel accepted? A greater connection might come with time. Talking about it will probably help.