I know it may sound odd in English, but isn't "私はもう沈みたい" more of a "I want to sink already"?

Caucasus said:

I know it may sound odd in English, but isn't "私はもう沈みたい" more of a "I want to sink already"?

Hmm... with みたい at the end, doesn't it sound more like "Looks like I'm going to sink"?

It's 沈み (from base: 沈む) + たい
Expressing desire

It's expressing desire. The case firechikara talked about should have て+みたい to means "try to do something" or a noun+みたい for "looks like something".

The problem is with the last line. It literally means "Become happy" but I don't know if they use such grammar in English or not.