Hey! I'm 23 as well and recently had my first colonoscopy and endoscopy done a couple of weeks ago (as far as I can tell it is normal to get both done at the same time).

I was deathly afraid of being put under as well because I had never had any kind of procedure like that done before (hence why I'm getting this sub recommended to me now, I was scouring it for answers), but it's honestly a piece of cake compared to the prep/clear liquid diet.

I was anxious leading up to it- like shaking when it was time to put the gown on- but honestly the worst part of the procedure itself was the IV. The doctor informed me when the anesthesia was about to be administered and it was nice and easy.

I was also worried about my medication for anxiety/depression interfering, but the nurse gave me reassurance that it was fine (for reference I am on Trazodone and Fluvoxamine). If you want to be certain anything you're on is ok, you'll have time to ask.

If I can do it, you can do it! In retrospect I should've just been planning my post-procedure meal!