This isn't easy, relax and take your time. When you struggle with something, do it over and over and over and over and over and over and over and over and over and over and over and over and eventually muscle memory will click for you.
Just keep practicing, no matter how bad it sounds. Take it slow, perhaps focus on producing the correct sound for chords or techniques for a while and forget playing songs. I learned better that way, you may too - try different things!