For my multi-talented sister, able do anything with ease, it seems that my commonplace self is something whose existence she finds very hard to forgive.

様々(さまざま){さまざまな} 才能 に 恵む[01]{恵まれて}~ 何でも{なんでも} 卒なくこなす{そつなくこなす} 姉(あね) に取って{にとって} 平々凡々{平々凡々たる} 俺 の 存在 は 酷い(ひどい){ひどく} 許す[02]{許せない} 物(もの){もの} らしい