I need some advice

For the about the past 10 months i’ve had some noticeable changes in my mental health. I’ve become a lot more prone to being depressed, to the point where I will wake up depressed for no reason or the smallest things will have me stuck in bed all day. I’ve also become more irritable, to the point where i avoid confrontation as much as possible and where i can’t i just blow up so easily (i’ve been trying to practice just walking away more). It started out as minor mood swings every now and then but i feel like I’m slowly spiraling now. The latest change i’ve noticed is im getting suicidal ideations now i think. I’m not sure if that is what it is but i’ve just been feeling a nagging in my head. I would never do anything I have people in my life i love a lot but I’m just worried for my mental health going forward. I’m hesitant to go to my parents about it. I’m 17 in the united states and i leave for college in the summer. I come from a family where we have never talked about mental illness or depression. I’ve thought about waiting until college to seek help but i’m struggling and i’m not sure i wan’t to wait until then. I don’t want to hurt the ones i love around me.