Replying to Wow i need some help right now- just cought w/weed and MIP in the same week

well, it finally happened. i got cought. First off let me say that i never considered myself a druggie, i always had good grades and did well in sports, well today, i got cought with more than just weed. first here is a background story.

Ok so a little while ago (the week before school) i had a small party, and got busted for drinking by my rents. They were pretty chill about it and i thought everything was all good.

Fast forward to this past sunday night (monday was columbus day so we had no school the next day). i drank with a few friends, also had some dxm in me. fun night, untill i got arrested and charged with a Minor In Possesion Of Alcohol. i got driven by the cops to the station, breathalized, printed, yada yada yada. my parents were pissed off so badly. no car, no phone, no anything.

fast forward to today. i get picked up from crew (a sport) by my parents (no car, remember?). i told them the consequences that i have to face for getting arrested (sports wise- i talked to my coach about it). she said thats good, and then told me she searched my room. She found:
-Empty bennadryll box (stupid i know)
-A few empty bottles of cough syrup (not as dumb as you think, but my parents probably think im a dexed out retard now)
-Pipe
-Brothers vicodin from august
-Lighter
-Bowl

she told me this and i felt like so much shit, you really have no idea. my mom told me that she was afraid for me (i think the pills/dxm is what did that for me). she said that she was truley scared, and she was in tears the whole way back.

i told her that i stopped everything a while ago, and she says she belives me (although i still use dxm/weed occasionally). i should piss clean pretty soon though, since i havent smoked for a while now.

this experiance has totally kicked my ass. I kinda want to tell them to put me on drug testing, just to prove that im being loyal to them. Ive decided to quit all drugs for good. no fucking way im gonna go through this again. I will drink occasionally out of season, and only in a 100% safe enviornment. I feel like shit right now.

what are some ways i can gain trust back, or basically start to fix everything ive done?