Answer: Its a very personal question but if you are looking to wear shorts or skimpy swim wear then yes, trim them. Though they do grow back thicker! I recommend to wax because you wouldn't have to worry about hair for 3-4 weeks and the hair becomes thinner so over time you wouldn't have anymore hair or little to no hair. Always ask your mother or father because some parents won't let their kids shave till they are 16-17 because razor cuts are painful and if you shave quickly, then you get shaving burns and those are bumps that are itchy and over time could change colour, but of course these bumps go away.
If I were you, then i would trim my legs
But ask your parent or guardian for tips!