Not sure what to do

i wasn't sure whether to post this here or in the psych specialty forum. i am a 40-year old new grad nurse (dec. 07). i've been working on a med-surge/oncology floor that gets a lot of psych/detoxes as well. i was originally going to school to be a substance abuse counselor and then changed gears to nursing for a lot of reasons (financial, flexibility, growth potential, etc.). anyway, all of my instructors, my own nurse practitioner at my md's office, and others have drilled into me that i need one year med surge. i really am striving to do that, but my head is telling me, why be miserable for one year doing something that you don't want to do. my passion is with helping alcoholics/addicts, but i don't want to pigeonhole myself into "psych." i just took at part-time job at a mmt clinic not to get into that controversial subject. i work 4 eves now on the med-surge floor. there are a couple of positions open on the psych unit of the hospital i work at now, but since i only have 4 months, i think it is frowned upon to transfer. you need a minimum of 6 months. i'm just looking for advice/opinions. i mention my age because i don't know how long i'll be working -- hopefully, 20 years. i could see myself working with pregnant addicts, adolescents, etc., but don't really see myself working happily long-term in med/surge. although i want to help people, i just don't feel the passion that i do for the other area. then part of me doesn't know if i am running out of fear. i do like the people i work with, the physical aspect of my job, and most of the pts. sorry this is so long.