I know how hard it is to found out the strumming pattern. I was giving up the guitar for this. However I learnt that more then learning the strumming pattern, it is the "feel" of the songs that matters. If you hear different live versions of your favourite songs you will never find the same strumming pattern, I bet. So, I would suggest, do not try to just replicate what you hear, get the feel of it. Should be easier but rewarding anyway.