Ella's speaker loves heavy rain, and the poem keeps returning to that one line, like a heartbeat. Each time, the rain gives her something different: a view from the window, a cover for crying, a way to feel her insecurities slip off. Because everyone else hurries for shelter, she can stand outside in the downpour and let her sadness show without anyone noticing.
The rain also mirrors how she feels. It is cold, it makes people crave company, it makes them wish they had stayed home, and each time she says "like I feel." So she isn't escaping her loneliness so much as seeing it reflected back at her. Even her walk "to look for rainbow" suggests a quiet hope under the gloom. The mood is melancholy but oddly soothing. The last line, "And I like what I feel," is the turning point: she accepts her sadness instead of fighting it.