Well I suffer from depression so I know what it feels like
You can't make the statement ''it's just depression'' depression can be extremely serious and if not treated properly well it can lead to suicial thoughts.Some people dig themselves such a whole that they hit rock bottom.Distracting the mind is the key.You need to talk to your dad because it will help you and he has the experience.Don't bottle it all up because you will get nowhere.Meds can be very useful aswell.
It's just depression.. you may need to see a therapist theychelp alot to cause noone is around and you can exspress your feelings to them and they wont judge you and when you feel that way warm up some tea as hot as you like it might taste nasty but it helps and go outside around your house and walk for 2 hours also do something that makes you happy it also helps to if you need me email me ***@****