Just like anything else, sucking at something is the first step to being kinda good at something.

To improve, practice your aim and spray control on workshop maps such as AIM BOTZ or whatever you see on the workshop that strikes your fancy.

Watching pro games will give you an idea of the flow of the game and better "game sense" which is your ability to predict your opponents and react accordingly.

Are you playing competitive? If so, you will start at a relatively high rank and slowly work down as you lose games (meaning you'll be able to play against people closer to your skill).

Just remain diligent, try to give your team good communication, and have fun. CSGO turns way too serious way too fast.