I’ve noticed that Zillows estimates are way below many other websites. If you look at your address on Redfin or Realtor you’ll see it’s valued much higher, close to what you purchased it for. Buying a home is scary, yours is lovely and it’s on 15 acres! Wow, I’m envious. If the payment is comfortable, that’s all the matters in the end. If this was my home I truly wouldn’t be worried over what Zillow says it’s valued at. Especially when every other site has much higher estimates. Congratulations on your new home!