Can the doctor tell my parents if i tell my parents if i tell him i smoke marijuana or have suicidal thoughts?

I don't even know where to begin, i guess to start i will say that i have been going through alot in the past year. During my freshman year of highschool i finally felt secure and happy. I was friends with everyone and like by everyone, I was making above average grades and was a very fun loving person. It took me four years from when i first moved to there to get where i was ranked socially. But by freshman year I was on the top of the social chain played football,wrestled and ran track. I partied alot and had the good life. It all turned around laster when i found out id have to move to a small town in oklahoma. Since the move i have started to feel unstable and unconfident. I have always felt like I could never make my parents happy, by not getting perfect grades ect. And whats even worse now my older siter who is the only member of my family who i am close to is in college. My younger sister is completely fake she even admits it behind everyones back. My parents treat her better than me like shes better. They even talk about my older sister and say demeaning things and it makes me angry cause shes not here to defend herself and when i defend her my parents just get more mad. It seems like whatever i do is not enough. I started smoking week alot during my freshman year and drank alot of alcohol. Despite this i still made great grades(a's and high b's) and stayed out of trouble. Just before the move I got in trouble at my going away party because there was alcohol there. The party was at my friends house. The next day i completely took blame and rectified the situation best i could. What really hurt me was that my friends were responsible for the majority of the blame. It really hurt because they just let me take the fall which i would do anyways but it felt like the didnt care and that i was being cast away. I got my phone taken away so i havent been able to talk to any of my loyal friends and i have made friends here but i dont feel like i can trust anyone yet. I have ben feeling really depressed because of feeling like im being cast out, my parents are dissapointed and treat me worse than my sister, I miss all of my friends and i fell lonely. I have been depressed before at times during freshman year but it seems to get progressively worse. I smoked weed and drank alot to cope but never let that get in the way of achive academic excellence. Its really weird because i used to be social and really nice and outgoing. Now i say to myself i want to be that way but i just cant express my true self to the new people here. Its like i cant trust anyone since i was hurt by my other friends. But my main question was that if i told my doctor that i smoked and drank could and would he tell my parents? Same with suicidal thoughts. I have done lots of thinking and come to the self realization that if i really wanted to kill myself i would have already and if im going to kill my self than its going to happen. Will my parents find out from the doctor if i tell him how im felling? Please respond i feel lost and dont even know how to feel anymore wether i should be happy or not care or even just end it.