Is there such thing as severe blackhead problems?

im 17. i never wear makeup And i am covered in blackheads. from my nose to my cheeks to my neck to my shoulders, and chest to my entire back. i don't have much white heads. im hispanic, and i have giant pores. my sister has them to. and i don't think its puberty i went through that at age ten. i don't eat very healthy, and ive tried lots of things (proactive, clinique, neutrogena, aveeno, steam,even herbal soap for blackheads) and everrything seems to dry my skin out. to the point where it hurts to make facial expressions. dermatologists are expensive and most of them dont cover medical. what shoul i do?