Myrtle beach, SC

I have 4 kids ranging from 15 years to 3 years old. My mom booked a trip for herself and me for a week— We are driving there, supposed to leave this weekend. The plan was they would be with their father, I trust him 1000% and I would never let any one else care for them but all I can think about is what if something goes wrong and I’m 800+ miles away. Is it selfish of me to want to go on a vacation without them for 7 days? I want honest opinions because my anxiety is telling me not to go but on the other hand my life for the last few years has been strictly work and take care of every one else, I rarely ever get out or as they say “me” time.