should i hack?

I will assume why you want to hack is because you feel like you suck in the game. Let me tell you something, cheating is NOT the solution.
If you want to get good in the game you will have to put in hours and hours of training. You can't just join a competitive match and think you know everything.
My advice is to practice a lot of granades, smokes, molotovs and flashes. If you have the option, play with better players. Players that are better than you. There is nothing more frustrating than solo-queueing and matching with some greifing russians that just want to make your life hell. If you can, play full lobby and play with people a lot better than you. At start you might not get many if at all any frags. But you will pickup strats, aim and nades as you go. I wish you luck and I hope i changed your mind to if you were going to hack.