This reminds me of the recent Johnny Cash discussion. Here was a guy who had a big, bold, rough-edged bass voice in a time when lead singers in his field HAD TO BE twangy tenors or slick baritones. It didn't hinder him because he didn't fit the mold, rather he contributed his own style and literally brought many millions of new people into a love of country music.

Do you long to accompany yourself? if so get a folk-oriented teacher who can suggest an instrument and get you started on learning it.

If you really don't (and it can be too difficult to play 2 things at once for some of us, voice and guitar, or whatever) then don't. Sing unaccompanied, but learn more about your songs and maybe get a vocal teacher if you're unhappy with your phrasing or whatever.

It might also help to join the best choir or vocal group you can find, offer to do solos, but also learn to 'tone it down' and 'blend in' when you wish to. This will make it easier to jam with folkies later on. If you have a big voice, lend it to community musical theatre. Any of these might make you more knowledgeable and comfortable in your skin, and it doesn't mean you're abandoning folk, just that you're exploring your abilities.