You spend real time together. It feels like something. But it has no name, no direction, and asking about it somehow makes things worse. If that is where you are, you are not overthinking it.
Short answer: if you are together enough to feel like a couple but there is no agreed direction, no clear exclusivity, and raising it changes the subject, you are very likely in a situationship. The confusion you feel about it is a sign the situation genuinely is ambiguous.
A situationship sits in the gap between casual and committed: enough warmth to feel real, and too little clarity to know where you stand. The ambiguity can feel accidental. Often it is doing a job for someone, and that is the part worth understanding rather than explaining away, because the uncertainty is doing something to you even when you tell yourself it is fine.
Early dating, casual-but-honest and genuine limbo can look alike from the inside, and telling them apart is the first thing that gives you your footing back. A situationship also says nothing yet about the other person's feelings; it describes the arrangement, not the heart inside it.
Write down what you actually know about the arrangement: how often you see each other, whether either of you sees other people, what happens when the future comes up. Facts on a page are calmer than facts replayed at 2am, and they tell you which of the three situations you are in.
Go deeper
Why You're Still in the Situationship gives you the psychology of why you are stuck, the assessments to find out where you stand, and the exact words to get clarity, commit, or walk away. Five profiles, full-page assessments and a complete script library.