- "I" cannot be possessive. If you're trying to refer to something that belongs to you, use "my." IT'S OK TO USE "MY!" "I's" is wrong.
- If, in your sentence, someone or something is doing something to you, use "me." This is also OK and GRAMMATICALLY CORRECT! Here it functions as an object as it should.
- "Myself" is reflexive. It is used when you are doing an action to yourself. You may not substitute it for "I" or "me."
If alternate uses sound more formal, get over it.
I vow the proliferication of crappy grammarness wiln't be the end of myself.