When I have problems like this I try to write it down, listening to the the song at slow speed, take it one measure at a time. Break it down note for note until I understand it. Then play what I have written, very slow until I get it down, speed comes once you know it. I just recently did that on Led Zepplins Rock and Roll, learning the basic grove ( which is difficult to me). Hope this helps.
And one more thing, you need to have better respect for yourself. If you tell people your not a good drummer then how can you convince yourself? Change that to Im still learning instead of Im a bad drummer. I speak with experience here, went through the same thing.
Good luck Jim!