I've always wondered, when does that sensation you get from going up and down in a plane go away? or when do you start to get used to it

Hello, and please let me thank you in advance for the help. I am 17 years old and a senior in High School. Recently I decided what to do with my life. I feel sad that it took me this long to realize it. Although I have always been fascinated with planes and the military I never realized I wanted to be in one. I am a good student; I currently have a