I would love some advice

So I’m making this post because I would really love to hear from people about my situation. So I’m 6 years younger than my boyfriend and we started dating on December 14th. It’s my first boyfriend since I never dated in school. Things were great up until we made it official and now I’m constantly thinking about how I miss being single and how I liked being independent. I don’t know if it’s anxiety and people get this at the beginning of a relationship or if it’s anxiety from this being my first relationship, but I don’t even know why I am acting like this. We have almost everything in common, he’s super sweet and funny, and my family and friends love him and I generally think he’s amazing, but also cant stop thinking about how I want to run away from this relationship because it’s giving me too much anxiety. I don’t even know what questions to ask at the end of this, I also just needed to say this because I don’t have anyone I can really talk to this about.