My grandpa wants to take my siblings and I winter camping which long story short is not a pleasant experience, I am sixteen with no job and I go to school online does anyone have an excuse I could use to get out of the trip?

BE HONEST.  ❤️

I've been winter camping... ONCE!!!!  Never again!  Just talk to your parents and grandparents.  If you aren't a woman in menopause needing to cool down, pfffffftttt!!!!  Tell them the truth.  Physical discomfort isn't fun for you. 

❤️  But remember, they're you're grandma and grandpa.  They love you.  They want to be with you.  Tell them camping in warm weather is more your cup of tea.  What ideas can you come up with in winter to spend time with them?