Do I actually suck at this game?

Dwigt: Hey Kukuru, No you don't, you're just new to the game and that's very normal  I recommend you to re watch replays and maybe analyze them with some friends. There's a lot of mechanics that you should practice time and again. Watching pro players and streamers can help a lot but there's a lot of basics that you should master before trying the advanced level plays. Part of the learning curve that you mentionned. 
Platooning with friends helps a lot. I still ask my colleagues to watch me if they're available and to provide some tips or tell me what went wrong. Actinid the French CM knows  but 1 small tip on how to position my Russian heavy T-150 helped me improve my games.
Focusing on some tanks (Heavies, Mediums) helps you learn from you past mistakes. Check this new forum section that we just launched and feel free to drop game mechanics questions there!
http://forum.worldoftanks.eu/index.php?/forum/3077-game-mechanics/ Feel free to add me in game as well!Good luck on the battlefields