Go buy a ton of apples. Peaches would be better, but getting their seeds out of their shell is a bloody pain so if you're not smart enough to know how to get them out of their shells just stick with apples. If you live with your parents, sneak them upstairs into your bedroom, along with a knife, some kitchen roll so you don't make a mess on your carpet, some heavy duty black bags, and if you're dumb, a few glass cups, or if you're smart, an airtight container.
Now cut the seeds out of the fruits, put them into your container of choice, put the cores in your black bags and hide them in your wardrobe. Don't mind the smell. When the coast is clear you can take your bag outside to put in the bin, ideally not at the top of the bin. Or if you're super smart, put them in someone else's bin when no one's looking.
Once you collected enough seeds (preferably more peach than apple), go buy yourself a blender and hide that up in your bedroom as well. When the time finally comes, blend those seeds, quickly tip them into your favourite drink and ingest. Now 1 of 2 things will happen:
1. You didn't get enough apple/peach seeds and/or did not store them properly and give yourself a tummy ache.
2. Congratulations, you just got cyanide poisoning! Now you can enjoy the worst pain you've ever felt for the last few minutes of your life as you succumb to a terrible burning sensation in your insides as you scream why the bloody hell did those movies with cyanide capsule lie to you!
...I did that all the way up to buying a blender... ;>_____________>