Comparing Things

I'm great at comparing things, mostly by telling their differences not their similarities, but if you want me to tell you the similarities/differences of a poem, there is no way I can do it. I don't understand poetry to begin with, so I can't tell you what each poem even means, but then add in the fact that I have to compare them and I'm completely stumped. That's what I have to do with my Critical Writing class for tomorrow, and I'm not sure what to write how what the poems mean. They are too modern for there to be an analysis online, so it is all on me to figure out. Thanks so much google, you failed me. -.-