I'm going through a similar experience. Ever since I graduated college last year and got engaged, I've had a lot of anxiety about "normal life" and things like that. It scares me that soon I'm going to be responsible for my own house (I've lived with my parents all my life), get a "real job", and have adult responsibilities. Honestly, adult life seems like it sucks and I think that's part of it for me. Another piece of the puzzle is that I don't know what I want to do with my career, because my bachelor's degree is pretty useless. The thing I wanted to do turned out to not be for me due to some issues with injuries and blood.
So I have four years of school under my belt and no idea what to do.
But anyway- I feel the same way about life. It just feels weird sometimes! There's no other way to describe it and that's frustrating. I overthink EVERYTHING and question myself constantly. I fear depression (because I'm not anxious, I'm a very happy, fun, outgoing person), and the fact that anxiety has come into my life and made me question everything makes me worry that il develop depression, and to me, there is nothing scarier. How do I deal? Try to live as normally as possible. I'm a firm believer in "fake it till you make it"-- that is, if I go about my usual day or do things that I'd normally enjoy pre-anxiety days, eventually I think my Brian will stop trying to scare me into thinking normal life is weird. I also try to pray and do breathing exercises to help me live in the present moment. Think of life on a day-to-day basis: all you have to do is be your best self today and the rest will fall into place. Of course, I know this advice is easier said than done and some days are suckier than others, but hang in there! Go do things you enjoy and don't let your anxious brain stop you :)