When i shoot i feel like im going to get blocked?

when i shoot a jumpshot with a hand in my face, i feel like hes gonna block me so i always alter my shot and throw up an uy shot with a ton of arc and no confidence. how do i get better at shooting when im near getting blocked? i watch nba players shoot in games and they are only a couple inches away from being blocked on every attempt. how do they never get blocked!!? also i practice by taking 300 pullup jumpshots everyday. is this the best move to make sure i wont get blocked becuz nobody can jump when theyre goin backwards....thanks!