While we really should "respect the wishes of those who have died" in reality the funeral is not for you, it's for the people at the funeral. There is no you at that point. You are gone. And so while I would hope people would respect wishes, I know for a fact they often don't.
As for "wishing I didn't have a funeral at all", man, this is the 100,000th time I've heard a suicidal person say that. You are kidding yourself.
Unless you are totally alone, with no kin, no children, no parents, no friends, no family, no neighbors that know you, no coworkers (there are a few people out there like this, but it's rare) there WILL be a funeral for you. It's so naive to think otherwise. But we've all been there, during depression as a teen I believed "I'd have no funeral probably".
As a grown adult you need to know, there will always be a funeral. Always. What else are they supposed to do?
The police will come to your parent's/spouse's/next of kin's door and tell them you are dead.
Will they say "Welp, that's shitty!" And just go to work the next day and continue life???
There is always a funeral. Rare exceptions. Someone has to pay for it too unless you left money. Could be anywhere from a few grand to $10k. Funeral homes rip people off when they are in emotional states, particularly with suicide. Nobody knows any better. I mean, when was the last time any of us paid for a funeral? What's a good price? The financially savvy elderly will pay for their funeral ahead of time, when they are in their 80s or 90s, and try to work out a good deal, just like at the car dealership.
Most people weren't expecting your death, and they didn't likely have 6K ready to spend at the Funeral home, but they can't say no. The coroner delivers the body to a funeral home once you are pronounced dead. So your loved ones will be getting effed by the payment plan, probably paying off over months or years, ultimately paying much more as a total price.
But you can't really be financially savvy and go to the funeral home ahead of time. If you have the ability, leaving some money behind would help out your folks or your family.
But most people don't so, it is what it is.