In need of an advice.

In September I finally found a girl. We both like eachother a LOT.

She's just too perfect. Kind, supportive, funny, smart, warm. She gives me happiness, peace and hope. She makes my entire life better. I talk to her and all the problems along with anxiety and all these bad and dark thoughts simply disappear and the world becomes a better place.

But I'm very scared. Scared of accidentally hurting her in any way. Scared of losing her. Scared of not being good enough (Truthfully I still think she's too good for me). What to do? How to kill all that fear?