Can't get started writing? Make a list of words.
Here you go: "Summer, hot, rain, sun, sound, tree, highlight, neglect, glass---"
Make a list of words at least half a page long, if you're writing by hand, and 100 words long if you're using a computer.
Any words will do. You're just free associating, so who cares what comes out?
Pick any three of your words and use them in a paragraph.
You should be feeling much more relaxed and inspired now. If not, wash, lather and repeat.