Chelsea's short poem speaks to anyone who has felt stuck with a problem they can't fix. It opens by admitting something honestly: sometimes it is hard to deal with things we have no control over. The "yes" in the first line feels like a small sigh, as if the speaker is agreeing with a worry before answering it.
The comfort comes in the middle, where the speaker says "It will get over," and then widens the thought: nothing lasts forever. The last lines are the most interesting. The speaker lists "us," "happiness," and "pain" as things that will end. That's not entirely cheerful, since happiness fades too, and so do we. But the idea works as relief. If pain can't last forever, neither can the thing weighing on you right now.
The mood is quiet, plain, and a little bittersweet. The uneven capitalization and loose phrasing make it sound like someone talking themselves through a bad moment, trying to find calm in the idea that everything passes.