I have just started getting used to thongs/g strings and I bought a few that had double straps and a few jewel type things on the back, and I'm not sure if it's just me but I just can't seem to wear those they feel a little strange. Just me?
Got some really comfy double strap ones from Victorias Secret like ineverycity suggested, they feel a lot better then the ones I had
I really don't like any kind of underwear with thin straps. They cut into your skin and leave marks! It's just uncomfortable. My suggestion is that you find some thongs made of lace. Aerie makes some really comfy ones with wide lace straps that don't cut into your skin at all.