Should I cancel my trip?

hey 21F here and i’m going to london and amsterdam in march! i booked the trip kinda impulsively, mainly because im going through a bad breakup right now and i feel like it’d be good for me. the only problem is ive never been on a plane or a train 😭 and now im literally getting on a 7 hour flight to london, and from london im getting on a 4 hour train ride to amsterdam. my parents are calling me stupid and saying that i should’ve started with a domestic flight first, especially since im by myself. i get what they’re saying but how will i fufill my dreams if traveling the world if im sitting around waiting for people?

do you guys think i should cancel my trip? or should i still go? do you think ill be okay?