Bf question

Que

-Bf writing this post...

My gf has had 6 sexual partners besides me and we are 18. She was my first to loose my virginity to. I am many times overwhelmed by her past knowing she has tried nearly every position and knows exactly what pleasures her because other ppl have achieved this pleasure. I want to be less insecure ofc but i feel lack of special connection when we do things not that she really expresses it but because of what im thinking. What can i or we do to get over this