I'm sorry to disappoint you, but it is very unlikely that you are gonna succeed in this.
First of all, to have any access to assisted dying you need to be a citizen of Switzerland which is already hard to get in the first place - at least without finding a job in Switzerland. And even so, euthanasia there is mainly available to people with terminal illness or the elderly in general. Afaik you'll have to be cleared of having a "mental illness" by 2 separate psychiatrists, which probably they'll never do if you mention you wanna die and you're not terminally ill and/or old.
Some people have also mentioned the NL and Belgium which seem especially appealing as an EU citizen because you can just easily move there and they also permit euthanasia to the "mentally ill". However, these are only granted in very rare cases and usually when the patient basically has endured years or decades of suffering and tried every possible "therapeutic means" that they deem to have a high success rate.
I know that this is very frustrating, I've also done a lot of research on this topic, as I've seen this as a good alternative to get a safe and peaceful CTB. Sadly, it's very unlikely to be successful at the moment and in the foreseeable future...