Why do I feel single even though I’m in a relationship?

I’ve been dating this guy for about a month now, and he is my first boyfriend. He is the cutest and kindest person ever but I just feel like nothing has changed in me. I feel single, I don’t feel like I am in a relationship. I’m obviously committed to this, and would never cheat. maybe I just haven’t realised that I am dating someone. I don’t know but it confuses me. What do you guys think? I am 18 by the way
Why do I feel single even though I’m in a relationship?
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