Hello, I'm new here so I'm sorry if this is not the right place or if this is something that's been talked about a lot in the past.

So recently I had my first session ever, and as the title says I can't stop thinking about it.

In the session I felt weirdly disconnected from my own feelings, and it felt as though someone else was talking about me. I didn't know what was coming out of my mouth most of the time, and I downplayed and embed lame sarcasm/jokes into everything I said, and I laughed a ridiculous amount even though the topic wasn't remotely funny. I unconsciously avoided to mention a lot of things and I've been thinking "god, I should've said this and that" every so often. I consciously lied once, for which I've been feeling really guilty.

After the session, despite having avoided to talk about some of the most difficult issues, I still felt absolutely exhausted and I am now worried if I will ever have enough energy to get to the more difficult things in time, especially as I am moving out of my area in a couple of months. And since I had to let my guards down somewhat in order to talk about my secrets, I've not been able to put them back up. I guess it is important to not put them back up to make real progress in therapy, but then more things are on my mind now and I am struggling through my daily life more than I did before the first session. I can't put my fingers on exactly what things are on my mind now, but I'm feeling really overwhelmed, have been having some flashbacks to my childhood, and have been feeling miserable in general like I've cried a lot out of blue past few days.

Are these common in/after first sessions? Am I worrying too much?

Thank you.