The simple questions are always the hardest to answer.
What is like like to fly a jet fighter?
If you mean to ride in one that you are steering yourself on a nice clear day with no particular objective that you must achieve then it is about as exciting and enjoyable as life gets.
If you mean what is it like to fly a jetfighter AND be a pilot on a jet fighter squadron then the answer is not so simple.
In peacetime you could just find yourself operating in one of the most competitive occupations you can imagine where everybody else is trying to prove they are better than you. If your unit happens to be fighting a war then you will have to accept that the enemy wants to kill you.
If on the other hand you are trying to decide whether you want to try and become a jet fighter pilot the simple answer is this:- if you have to ask the question I am afraid you do not want to be one enough to overcome the obstacles that will be put in your way.