I think it's pretty normal to not be in high spirits about it all the time. Where it would probably count as unhealthy is if it was an actual active belief like "there's no way communism can win because xyz" kind of thing, or if it was general dooming like "we're doomed because the species sucks" or something.

Personally, though I have low moments for sure, I don't tend to feel that communism itself is in trouble because I'm confident that due to the way contradictions work, support for it will keep popping up and due to dialectical and historical materialism being a science, people would rediscover it even if it was majorly repressed. But also, China is right there and is doing quite well. The imperial core itself, I don't know, it's hard to be optimistic about it sometimes. But I think things are going to reach a point where that doesn't matter very much for the rest of the world and they will be able look on the (one day former) empire regions with pity rather than fear.