<human>: Can you summarize the given text in a few sentences?

Background: I am a senior in college. My friends and I planned a trip to the beach for the week. The trip is not costly (under $150 for the week). I tell my parents [51 and 52] about the trip; they respond apprehensively, and I sensed they want me to come home. My father informs me my grandmother's 80th birthday is during my spring break, and that he would very much like me to help drive the 8 hours to her residence to celebrate. If I go home and to my grandmother's birthday celebration, I will miss the trip entirely and spend the rest of break at home by myself. I call home and say I would prefer to go to the beach with my friends; my dad reacts by spending a good amount of time calling me selfish, saying I am making the absolute wrong decision, saying that he has spent hundreds of thousands of dollars on me over my lifetime, and threatening to take away the car I recently brought to school (among other things I discerned were said to induce guilt). Reddit, am I indeed selfish to go on this trip and leave my dad to drive by himself, while not seeing my family over spring break? Or am I in the right to choose to go with my friends? I would really appreciate any help you guys can give - it is really eating at me.
<bot>: Parents do not want me to go on a spring break trip; I do. Am I selfish to go despite their wishes?