i agree leaving what became an accepted comfort zone, having evening layed out, then you are let loose, full of thoughts of what's expected. its a culture shock, and half way houses are good for situations like yours; on lock down, not being able to grow and expand. sitting around this way is no good, you have too much idle time to use what you have learned.
did you have some one you could talk to easily about what you were thinking in there? start writing this stuff down when it becomes to much; you may notice a pattern.
sometimes jumping into a job right away is bad, if you excell at work with out drugs, which you will, is an awesome feeling, but the pressure can be a great excuse, and, its way too easy to find stuff at work.
do you have a therapist? i still see one, but want another, she isn't very insightful

music software is a good thing... im looking to get my hands on a version of logic audio.
you will of course earn your moms trust back, you recognize why, imaging if i had a child doing that was shooting dope is pretty scary,.i started when i was 14-15 with coke, & it took ten years to get over finally.
the longer it gets, the further you evolve away from that life, the easier everything becomes. easy and good compared to any inconvenient day with an iv drug habit, dope really is more complicated then its worth...
it sounds silly, but one day youll know, it will hit you among many other things that, i dont have to hide, run, chase, fear being out, and fear going to prison just driving to the store with a burnt tail
light...
remember well why you were in that facility, what you learned, the train of thought instilled, and your inner strength and charector/charisma that helped you through honestly.