My 21 months old always use his tongue and pushes his food out of his mouth.. Now I cook diff food for him everyday..he prefer bread.. is tis normal?

Two of my friends were in similar situations. One of them, like you, her son preferred bread to everything else. For the other, her son only ate crackers. Both of them chose the same approach. They stopped giving their children the preferred food. It was tough but it paid off after a few times. They would place the food they prepared in front of their children. When their children kick up a fuss and refuse to eat, they simply explained that it was that or nothing. When their children absolutely refuse (during the first time), they will take away the plate but offer it again after one or two hours. By then, their children are hungry and will simply eat what they were given. To facilitate the process, they also kept any bread/crackers out of sight. Very very tough for them to stand their grounds but worked in the long run. Both their children learn that kicking a fuss will not get them their way.