Need some help..

So i love to awp, i awp all the time in dm and sometimes in comp, i have a huge problem that makes me die and not kill the enemy alot. When i take a shot i press 3, then 1, so i shoot switch to knife and back to my awp. I do it right when i shoot so i can take another shot. Problem is, i dont shoot my gun, i just aim and then i switch to quickly, but now its like muscle memory. How can i make it so i dont switch before i shoot ? Thanks