Kylie Jenner has proven herself to be the most mature sister out of the Kar-Jenner brood, and in a new open letter posted on her Instagram, she addresses the many changes in her life - including losing her pal Jordyn Woods.

"I'm proud of myself, my heart, and my strength. growing up in the light with a million eyes on you just isn't normal. I've lost friends along the way and I've lost myself too sometimes," wrote Kylie.

During a recent preview of Keeping Up With The Kardashians, Kylie told her sister Khloe that she found it difficult to move on without her "security blanket" Jordyn, but that she's learned to grown on her own.

She continued, "my first tattoo was "sanity" to remind myself everyday to keep it. I've struggled with anxiety my whole young adult life and after my baby i dealt with all the internal ups and downs. I felt like i had to find myself completely again."

Read the full post below.