everyone seems so negative. Cheer up guys.
It can be easy if you start anywhere, everywhere that you can be. How? for example, since playing and singing is the problem, the problem is not your playing or singing.
It is your rhythm and maintaining tempo. If without singing you can play all the chords at perfect timing, then it IS getting the hang of your rhythm.
Try this.. forget about the guitar part. When or as long as you are free, sing. But sing with your feet tapping on a 4/4 rhythm. Can do it? Great. try using your fingers to simulate the easy drum beats of that song.
For example take "nothing else matters" for instance. The drum beat is not 4/4, therefore if you can tap your feet to that and sing. You will be able to do it on the guitar.
Also you guys have to remember, that a C chord strum four times dun necessarily means that you have to sing ONLY at the times it is strummed. Sometimes you need to do it so slowly to realise that you may have to sing before you even strum it, in between the beats.
Okay, i said enough.. hope i didn't miss anything or said too much. I can strum and since the day I pick up the guitar during pri six. Not that I have talent, but because before I can play the guitar i like to do those "taps" and sing. I think it works.