How do you know if you're overthinking a relationship or if something is actually wrong?

21M I’ve been seeing someone for a while now. There’s no major issue — no cheating, no big fights, no toxicity. On paper, everything looks fine. But I keep feeling slightly unsure. Sometimes it’s small things like delayed replies, lack of deeper conversations, or avoiding future plans. I can’t tell if I’m just overthinking normal relationship stuff or if these are small signs that we’re not fully aligned. I don’t want to sabotage something good, but I also don’t want to ignore my gut feeling. How do you figure out the difference between anxiety and actual incompatibility?