to call yourself a really wacky type... then 엉뚱한 does the job quite well but it may have a somewhat negative tone to it to describe someone, simply because korean culture seldom prides a person on being so different from others. use with care.

well, 기묘한 can be used in any wierd situation and to describe for the other person, i guess, if you say to express yourself as 기묘한 i would say "나는 독특한 편이에요"라고 할것 같아요.