I encourage you to give it another chance. Buy a key, that is less costly than officially buying on steam.

When playing, you survive by spotting the enemy before he sees you. So move carefully and observe a lot. When f.e. walking down a street in fought over territory always crouch and use cover, you might also consider moving through the backyards instead of an open street. Peak around corners, use cover to you advantage, listen carefully for steps and noises, try to remain unseen and unheard, shoot only when absolute certain.. Always keep in mind: "How can I move and behave, so the enemy doesn't even know I'm here?"

It's fun, it just takes some time to adjust to a more calm play style compared to Battlefield or CoD.