、。
To be honest, I'm not really interested in sports.
Literal
True [possessive-の] thing [object-を] say [conditional-と], I [topic-は] not-much sports [target-には] interest [subject-が] not [feminine-の].
あんまり (casual あまり, 'not much/not really') paired with a negative creates a soft understatement. 興味がない ('have no interest') takes には for the topic of (dis)interest. The sentence-final の is a feminine softener.