What is deadlift? Are you talking about strenght, or specific exercise?
Here is a recommendation. Jump in a swimming pool. Have two guys your size jump on your back, you need to keep head and both hands above water. Then swim few times across the pool. Then start over for an hour. Keep in mind that average waterpolo player is 190cm/100kg. That's waterpolo. ;-)
I wish you dont have to show your "strenght" to pro player.
Nobody is accusing you of not being strong. However, just being strong does not make you (or anybody else) an expert in exercise science. Neither am I. However, in theory, building muscle is easy. You eat a surplus of calories and create "trauma" to your muscles. Generally, the best way to do that is by compound exercises, like squats and deadlifts, and progressively increasing the amount of weight. Many people get discouraged when it seems like they aren't making any progress. Very often, it's because they've forgotten the caloric requirement, and simply need to eat more.