Awww, yearning, big hugs for your 5year old if you want them...
And I don't know how to say this without sounding patronising, but I really don't mean to be...at 19, yes you're a grownup, but still a child as well. I had my first child at 19, and I think I got stuck a bit because I was still a child myself.
It's okay to be needy, and need cuddles and comfort. I know that this can drive people away irl, because they often have their own needs...but your t is here just for you, so if there is one place that you can hopefully be needy without Rejection it is with your t.
If you can manage to open up and be vulnerable with her, you may be less needy with others and be able to have balanced, healthy relationships because those needs are being met in therapy.
Which is all very well for me to say, because I can't be vulnerable in therapy ( or irl either) and I have a damaged 14 year old somewhere inside who I am horrid to.