I'm new to running (started about 3 months ago) and am doing my first 1/2 marathon in a few weeks. So far I have completed a few 5k & 8k races. Anyway - I need some help on what to wear for the 1/2. I like wearing shorts, but don't want to have a thigh chafing issue.

I've been wearing bike shorts under my running shorts, but that is really hot! Any suggestions? I'd love to find a longer inseam running short, but have been unsuccessful.