hi hello i am not a pro in this area BUT as far as i know, the normal thing is that when you're freaked out in your dream while knowing damn well that you're in a dream and try to wake up, you will wake up almost immediately. that's usually what happens to people who failed to shift, and me on a daily basis as well. but again, i'm not a pro so i'm not sure :)
first of, not on mangago cuz ull get restricted!
im not100% sure abour ur experience but when we dream, our body is already in a state of paralysis to stop us from acting out our dream in real life, im sure you were just having a scary (lucid?) dream, got very shocked and woke up before ur body did, hence why u couldn't even open ur eyes. ive also had a scary dream like that aswell! u see, its possible, but shifting on ur first try is kinda hard! esp when u have no intention to. although if you are still weary, try and state that you are not trying to shift, and u want to stay in ur current reality next time u fall asleep.
so i'm not even trying to shift realities but, i was having this very realistic dream and as i was walking in that dream it started feeling real and my vision was spinning for some reason. BUT i got scared and tried to wake up by moving but I couldn't and it feels as if my body was not concious. Now idk if it was shifting or I was just having a sleep paralysis. although i also wasn't able to open my eyes that easily either.