An alcoholic issue

Okay, i have NEVER posted on reddit before. I have read a couple things and have seen a couple things off of tiktok but i feel as though it is a thing of people older than me. I am 15. I have an issue and when nobody amsweres at 4:00am i thought “I guess ill give reddit a go”. Yesterday (6.00pm) I was out with my cousins (m 15/ f 12) and i wanted alcohol because im a teenager. As we all do. My male cousin, lets call him Bob (fake name) said “I have a friend who could totally get some for you”. I called this friend up obviously seezing this opportunity and to my great surprise he rocks up with a 700ml carton filled with peach juice and some sort of alcohol. I dont know what it was but boy did it get me drunk. The alcohol REALLY hit but 6.30pm and when it got to 7pm we have to go back to my cousins house. I stayed away from my aunt and went straight upstairs and i fet over the moon. At 8.30pm i had to go back home. As soon as i walked in my mum said “Are you drunk?” Obviously i denied it and said “No!? Drunk?? Ive been with my cousins the whole time! Where would i have gotten alcohol from?” She then questioned my hiccups and i said “Oh no i just ate french fries, the crisps” which was true but that didnt matter. Even as the words were coming out of my mouth i knew i was slurring. I went straight upstairs and got into my pjs, took my makeup off. I hit the bed and fell asleep (about 9.00pm) I then woke up at 3.00am and went into panic mode. I was not yet hingover but i knew it was going to come. I am still panicking and it is now 4.30am. I am feeling sicker by the second. My head and stomach both feel as though they are about to explode. My mum leaves for work however before i usually wake up and i am hoping my stepdad is going to work too because that leaves me with an empty house. Thankfully i am homeschooled so i have no school in the morning. I think even if my stepdad was to stay home and realise how hungover i was he wouldn’t tell my mum because he isn’t that type of guy but id still like to know just in case if there is anything i can do to help this hangover or to hide it. I just need some form of help. This is all too much for my dumb teenage brain to handle (im 15).