Well, you can see it this way or another. Sure, for us it seems like Suraj is totally blind to see his real state in this house, coz it seems more than obvious that he istn't considered as a part of the family. But if you see this through his eyes, it isn't so obvious. He was raised like this, since childhood he was treated this way and was told, that it was normal, that PPW would love him, maybe even more than Ratan and Prem. So, he has grown up with thinking the way, PPW wanted him to think and we can't expect, that his (for sure wrong) way of thinking, which he has since childhood, would just vanish in few days and he would see through all the lies, he has grown up with.
But I don't think, he's hopeless. One day, he has to wake up and open his blinded eyes, even if it's a long path 😉