おいらなんて、怒られっぱなしの人生だもんねーー。アハハ。でもおもしろくって仕方ないもんねー。
For me, it's the life of being got angry at. Ha Ha. But, interesting(ly)...it can't be helped ??
I'm guessing this is おもしろく (interestingly) with either って=は or って=と. I've never seen an adverb used as a topic before, but it doesn't really seem to work as a quote marker either. Can anyone shed some light here? Thanks.
The standard form is おもしろくて仕方ない, where おもしろくて is used as an adjective (not adverb) in the て-form for connecting predicates.
(て-form adjective) + 仕方ない
or
(たい-form verb in て-form) + 仕方ない
is a common phrase that means “It's so (adjective)” or “I really want to (verb)”. The nuance of this 仕方ない is “I can't stand it”, but it's not to be taken literally, just like when someone says “My homework is so hard it's killing me”.
The っ can be inserted in the くて for emphatic effect: かわいくて→かわいくって, うるさくて→うるさくって, etc.
It's probably a grammatical error. It's supposed to be おもしろくて but this person added the っ in before the て, because of a simple grammatical error, or to make an emphatic connotation, like "it's soooo interesting".
