Read guides, watch streams, and follow esports tournaments. Feel like a sponge that absorbs CS:GO tips and tricks to use them in your games.
Twitch streamers spend lots of time in the game, so they definitely know some interesting tricks.
Esports teams earn a lot of money, so their fights make up the best CS:GO possible. Watch matches and listen to CS:GO pro tips to learn a lot of new and helpful stuff.
Even your ambition to become a pro-player in CS:GO is not a reason to get angry and feel depressed because of losses. The game should be fun, and this depends mostly on your attitude.