Kelas, most civilians are not aware of what is required to be a cabin crew member / flight attendant these days.
The actual customer service side of things is actually a distant second behind the real reason that you are onboard.
Can you honestly say how you will react in a full emergency? Don't forget, it's not just you involved, there could be up to 400 people looking to you to save them.
Could you put a fire out at 35000 feet? Deal with an aggresive maybe violent punter? Work long hours with little rest. Put up with jet lag. Not the sort you get after your hols, the sort that is with you all the time?
On the plus side you will visit places that you have read about, and that the people on your aircraft have payed thousands to see. Have the best laughs that you have ever had, and behave badly whilst under the influence of alcohol .
Be under no illusions, it is a very demanding career.