Oh boy, I know the feels.
I mourn my stolen youth and opportunities every single day, daydreaming about my life could have been had I had more control and retaliation power against my numerous bullies and detractors.
Saddest part is, was I given to opportunity to, I wouldn't go back in time if it was to face the same circumstances...because there's nothing I could have done to counter-effect such nightmarish circumstances. Even if I made some VERY bad decisions, it's not about my bad decisions - they were just the consequence of a destructive environment on a clueless youth with an averageish IQ.
The shitty thing about youth is that you're pretty vulnerable to older, more established, and predatory people. No matter how " good at decision making ", well prepared or strategic you are, if you don't have a strong support network in your formative years, chances are you are going to be eaten away by snarky narcissistic individuals who prey on the weakest ....and things have veeeery slight chances of going as planned in your life. Unless you develop the needed "qualities " of apathy, machiavelism, and manipulation from a VERY young age.
I don't know exactly what events what brought you to this place, but I'm pretty sure you weren't dealt with the best cards in hand to begin with. Because everyone fucks up, thing is -the consequences, and the possibilities to find a solution are going to be different for everyone according to their circumstances and whether or not they have the time , energy, and resources.
I've made bad decisions, but Ive learned to forgive myself, and so should you... because no one knows the amount of cortisol, anxiety, panic ,and self doubt you were under whilst taking those decisions. Perhaps your choice were the best choices for what you knew them to be at the time.
Edit : quite frankly I feel like my response might be off topic , but I'm still leaving it with hopes that the main point of it gets across : it's never entirely your fault, and it's okay to feel sorry for yourself sometimes.