Am I in the right or wrong? Opinions and suggestions needed!

I’m 19, and there’s a festival on the 1st of January that I’m desperate to go to. The line up is great, all my friends are going and I think it would be a really fun way to kick start the year.

I bought tickets a month ago...and I asked my mum if I could go. She said no AFTER I had bought them. I haven’t brought it up, but now with it approaching in a few days I needed to either think of a lie or tel the truth.

Let me start by saying my track record with self destructive behaviour is NOT ideal for any parent to have to deal with. No excuses, but my dysfunctional family life, from 15 I started drinking and have progressively moved onto drugs.

Earlier this year I tried MDMA, a popular drug where I live - a lot of people do it. But I was doing it a bit much, to the point where I needed to go back on my anti depressants as my ‘comedowns’ were affecting my mood. I agreed with my doctor to not touch drugs, and I haven’t since - about 4 months ago. My doctor told my mum (a breach of patient confidentiality, but anyway) who got pretty mad.

Now, with a festival environment...yes, I’d be concerned letting my daughter go.

I wanted to do the right thing, so today I let her know I got tickets and was going to go. I used my money, I’m legally an adult - none of my other friends have to ask their parents to go clubbing or go to festivals, but I do. But I shouldn’t have to. I begged her, I told her I’d do a drug test the day after to earn her trust and prove to her I’m not doing anything wrong.

She went ballistic, absolutely nuts. Threatening to kick me out if I go, telling me not to come home. Her problem is the drugs, yet I’ve found a solution to ease her anxiety??

I’m at my boyfriend’s house. I can easily sell the tickets, but I’ve been looking forward to this for months.

Fellow teens, parents, anyone - PLEASE leave your suggestions/opinions!!

EDIT: peer pressure is absolutely not a problem for me, my friends who do participate in drug use know of my problems and are very supportive of my decision to stop using.