Heya Injest
Now I admit that video clip that you posted was one out of the box, however I fly exactly the same type of aircraft (my crew position is the rear door on the left handside to be precise) 4 to 5 days a week, and I fly into one of the world's most challenging airports due to wind conditions (last time I landed there it was a tad bumpy all the pax applauded once we hit terra firma ...oops I mean landed LOL).
Now I have come across more than a few first time flyers (and no mam the window does not open,, yes mam the toilets are unisex) , then theres the nervous flyers (like the lady last week who shot this terrified look at me in the midst of the safety demonstration cause the aircraft was making some noises during taxi, I just mouthed to her its ok and gave her a reassuring smile she was fine, and then there was no mam I can't hold your hand during take off cause my boyfriend wouldn't like it.... LOL).
You know Injest, the pilots have years and years of experiience, they know what they are doing. As cabin crew we have over 3 weeks of training, 2 days of customer service and rest is all about safety. So you will be in good hands. Its a pity you aren't in the same country as me cause you could come flying with me and to heck with the boyfriend, for you it would be an honour to hold your hand!!!