Learn Turkish: Şelaleden düşmüşlüğüm yok ama çok adrenalin hissetmişliğim var. - I don't have the experience of having fallen from a waterfall, but I have the experience of having felt a lot of adrenaline.

Adding -mIşlIk to a verb creates an abstract noun meaning "the experience of having done [action]". While hiç düşmedim simply means "I have never fallen", düşmüşlüğüm yok emphasizes "I don't have the experience of having fallen." It highlights your life repertoire, which fits perfectly with the contrast in the second half of the sentence.

Why does düşmüşlük change to düşmüşlüğüm with a ğ?

This is a standard consonant mutation. The core experiential noun is düşmüşlük (the experience of having fallen). When you add the first-person possessive suffix -üm to say "my experience," the final k softens to a ğ because it is now sandwiched between two vowels.

Why is hissetmişliğim written as a single word?

The verb hissetmek (to feel) is a compound of the noun his (feeling) and the auxiliary verb etmek (to do). When they combine, the s doubles (hissetmek), and Turkish spelling rules state that compound verbs with consonant duplication must be written as one word. The experiential suffix chain -mişliğim then attaches to the very end.

Why does şelale (waterfall) take the -den suffix here?