Stress vs anxiety? Videos , smoking.

I have 14 backs in my degree , my father told me that if you dont clear those backs within a year , he will throw me out from his house but  still i am not studying such easy books ...i really want to study but i have wrong coping system in my brain .. whenever i feel stressed ,my system want to cope from this stress & it engaged me in pleasurable activity like masturbation, watching you tube videos , smoking... And i feel temporary relaxation from that stress by doing such pleasurable activity...the problem is still there , i must have to study .. rather doing study i am doing these things to relieve my stress or anxiety...but i really want to study but i feel helpless with my these coping system...i am fustrated , i am not lazy for sure , i am not careless but still i am doing things like a careless ,lazy person... So would you plz tell me that what kind of medication is made for me ( ssri, snri, ndri, antipsychotics) ..this is my 200th query on practo asking about my disorder