My father passed away 3 months ago, and im depressed. Im tired all the time..i cant do the things I used to lOVE doing and ts so frustrating because its just not me.

So basically its just my mother and my three siblings and I, and im the oldest.
Im doing my BEST to keep it together...and so far its been working..im keeping the family stable.
But i feel at an edge..I just want something to take this pain away.

I was wondering if i could go to the doctor and tell her im depressed? Im hoping to be put on some kind of medication.
but how do I ask? im scared they might throw me in the mental institution and no one will take care of my family.

Im still a senior in high school, I work two jobs back to back after and before school. and on top of that I have to pick up my siblings from school. my mother works day and night.

i was just wondering if there was anything to relieve this stress and pain and sadness.

I just tried everything.

help me please.
p.s.
just to make it clear...im not suicidal.