<human>: Could you distill the essence of the text into 1-3 sentences?

Throwaway because I feel really stupid and selfish about this whole thing.

My partner and I recently moved into an apartment complex with assigned parking. We get two spots assigned to us, plus there's plenty of street parking that never fills up less than 200 ft away. We only have one car.

Our neighbors keep parking in whichever one of the two spots we don't use. At first it just kind of pissed me off (I'm selfish and petty), but recently they parked a car with no license plates there and are basically using it as a permanent spot.

If we have guests (which happens occasionally, and we're expecting to host a lot more often), they can't use our extra spot, and either park on the street or use a spot that isn't assigned to them, which makes me really uncomfortable.

I tried to leave a note, but when I came back home I noticed that the rain had turned it to mush on their windshield. At this point I just feel like I'm being selfish, as most of the time I don't have an extra car to park there. Could someone tell me if I'm being unreasonably selfish?
<bot>: Neighbors keep parking in our extra spot. I feel like a bad person for wanting them to cut it out. Please let me know if I am just being unreasonable.