I am going to start by saying SAME HERE! A month ago I felt so rhythm challenged I thought I might be hopeless at first.

However I am determined to play guitar. So my only choice was to keep going.

I started practicing with a very slow metronome on my phone. It was painful but it gave me a start. When that got too boring I switch back to playing along with the instructor over and over again at a slow pace until I could hit every note exactly in time with hers and it sounded like one guitar. The exciting thing is that I have definitely improved! I still have a ways to go and I'm continuing to up the speed but wanted to share my experience. It does come with time. I even go shoulder soreness and I realized part of it was building strumming muscle. :) So I suggest going back and playing earlier songs. If you're hitting every note in time then you've got it! Best of luck!

Oh yeah. Count out loud too. Even practice counting outloud with a metronome and no guitar to train your pace.