Read the story of Sara, in this pamphlet (her story is in two parts, the first is “What We Were Like”, then the second is “What Happened” - that’s how she found healthy living as a sober, contented person). Her story has many parallels to yours:
There are many recovery pathways but they all start with asking for help. It sounds like you’ve decided you want to make a change. That is good! You can do it, one day at a time.
There are many groups that have Zoom meetings and in person meetings, where you can learn about getting sober and you can find guidance and mentorship. These groups include Women For Sobriety, AA, SMART Recovery, and others. There are people of all ages in this groups, and wherever you go, you will be welcomed and people will understand your struggle. Most of them have been in exactly your shoes. (It’s worth looking if there are any specifically youth meetings - sometimes there are - but regardless, the people are all there for the same reason: to get sober. BTW my group is about half and half people under 30 and over 30, so there’s a good amount of young people in recovery.)
You can find a list of recovery groups here. There is also lots of good podcasts and books:
Welcome to Talking Sober! 
