I am doubting my decision of doing masters.

I got good university for mscs. Everything is done admission, visa, flight tickets, accommodation, etc… and now i feel that i am making a mistake by leaving the comfortable life, old parents, friends and good enough job. I decided to do the masters to elevate my career, for better pay, lifestyle. I had considered personal aspects as well but now I dont know if its worth it.

Why the fuck am I getting these thoughts at this moment.

Edit: thank you so much everyone. Your responses are really helpful. As i now know that its natural, i can deal with these emotions properly.