if deep down u feel u have a problem, then most likely its true...
i had my first major depression and reckless and irritable behaviour episode when i was 13 yrs old. i even remember then telling my mum that i think i have something wrong with me...i think i have depression at least. did she believe me? no. only because i was at a young age and she probably just fobbed it off because i was a teen. but i knew..i knew there was something not right...and now look...i have bipolar 2 disorder...i was right...i knew there was something wrong and because i knew i was able to track my moods and be vigilant as to when my symptoms would begin and end. i went to my school counsellor all throughout my years at school...if u have one i highly recommend u go talk with them..especially since it would be someone who deals with children on a daily basis...i know you've probably heard that from many responses to things like this...but i guess you'll see it again haha.
hope all goes well for u...dont worry about ur father not believing u...if u believe within yourself then its your will that will make u seek help..and thats the main thing