僕にはわけがわからないよ。

I; me; you; manservant

at (place, time); in; on; during; to (direction, state); toward; into; for (purpose); because of (reason); for; with; by; from; as (i.e. in the role of); per; in; for; a (e.g. "once a month"); and; in addition to; if; although

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

conclusion from reasoning, judgement or calculation based on something read or heard; reason; cause; meaning; circumstances; situation

indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and

to understand; to comprehend; to grasp; to see; to get; to follow; to become clear; to be known; to be discovered; to be realized; to be realised; to be found out

indicates certainty, emphasis, contempt, request, etc.; used when calling out to someone; used to catch one's breath or get someone's attention; yo!