I ran three seasons when I was in high school and experienced quite a number of benefits: obviously over time you will get better (do something during the rest of the year to maintain yourself), it keeps you in shape, finishing feels awesome when the people cheer for you, practicing doesn't require any special equipment, and it's something you can do on your own when you're older and go by your own rules.
Ultimately, it's your call. I didn't regret it.