I'm married and still insecure about sex

Tara Jane
I need advice! I have never spoken to anyone about it but I recently joined this app and I really feel free to voice myself to this really supportive community. 
I have always been really self conscious! It comes from not being comfortable with my appearance. 
However I have also always been really open about sex and being adventurous (despite never acting upon it since I barely dated or anything!)
I recently got married and I love my husband and we have a good sex life, but it's does not vary. Basically it's a go to method (which I have no complaints about!) but I have no idea how to 'ask' to get more adventourous! 
I can't make myself initiate it because I still suffer from the thought that maybe he is not attracted to me enough to want to initiate anything. 
Maybe I am the only one that wants sex. What if he does not want to. Maybe I won't be good enough. Maybe he will hate it. Maybe he will notice something about my body that he does not like. 
Now I know he loves me and he is attracted to me. But I can't get these thoughts out of my head! 
Have any of you gone through having these thoughts and insecurities ? What can I do to just loosen up? And what's a way I can initiate things with my husband ?