I am only 23, but so far the biggest mistake of my life is developing alcohol addiction.
It crept up on me in my mid-teens without me even realising and before long it had me in a choke-hold. While addiction isn't a "mistake" per say, my biggest regret is not reining it in as soon as I saw a problem arising. I was 18 years old when my drinking really began to get out of control. I KNEW it was out of control, I could have sought help or told someone then but for reasons best known to myself, I dived head first into alcoholism and almost enjoyed it at first, as if it was my dirty little secret that I had.
At age 19 I was at my worst. I lied to my parents, my boyfriend, I told the most abhorrent, bare faced lies in order to keep drinking - it eats me up inside now as I've always hated liars.
I treated people disgracefully, I embarrassed myself constantly, I nearly ended up in jail and on two occasions I was very nearly killed due to dangerous circumstances I put myself in during my drunken states. I turned up to work drunk, I would drink during the day, I would turn up at the village fate or the pub already slurring my words at midday. I said awful, awful things to my boyfriend which I still cry thinking about. He is so perfect, the fact I treated him so poorly baffles me, it's like I was a completely different person when I was drinking.
I have been completely sober for almost 3 years now and my life has been transformed completely, but I am still eaten up every day by the overwhelming regret and shame that I have for my actions during that horrific period. I feel undeserving that my parents and my boyfriend stuck by me and loved me unconditionally, despite the fact I was so evil to be around.
Every day I work to make myself a better person and my relationship has never been better, but I am carrying the burden of shame and getting myself into that situation and it was the biggest mistake of my life (hopefully the only mistake I make of that magnitude in my life). I don't think I'll ever be able to forgive myself for the monster I became, even if she is long dead now.