When will I be able to feel the kicks outside?

Angelina • 26. 9 years w/ my love. Married 💍 I'm an artist, nature lover, Crystal collector, mommy to 2 doggies and our babies, Lilliana 5/26/16 & Elena 5/10/19
I've this last week I've started to feel my baby kick.....but I can only feel it on the inside. Very soft little pokes. But when I put my hand to my stomach I can't feel anything. I'll be 18 weeks the day after Christmas. How much long would you say? 2 weeks? More?