Arish and Sumwur bring up good points. This was only my third season and I could not learn by playing pubs when I first started.
The way I did it and the best thing for a newbie to do is stick with the firing range, mastering the guns and turning on the dummies to hard or full combat where possible. The only time to go out into pubs for the first 6 weeks or so is to play no fill duos. This allows you to drop away from everyone, learn the maps on your own, and rat until there are only 2 or 3 teams left and have a practice gunfight with them (even though you lose its good practice).
I did this for about 6 weeks until I was so good with the guns I could hold my own in pubs and mixtape without people insulting me right and left. I also got as many warmup drills from youtube as I could find and got advice from this forum, like people on here told me to complete as many daily goals as I could to have a practice goal to shoot for. Thanks to this and the advice from people here I went from zero kill games to getting 7 kills in a game and even winning some.
So, I wouldn't give up yet, it just takes practice.
