first of all I want to commend you on your being able to be in a relationship with another in spite of your fears. Please take it to heart that this is a first victory for you! It may be hard still but you've made the first steps.

give yourself a break in the sense that you're new to this. There is a certain amount of doubt anyone will have in a new relationship, but you seem to hve a lot of issues that are related to your own self assurance and confidence. Try to understand the feelings of doubt and being unsure are natural but don't exaggerate them by dwelling on your own inherent self doubt.

Try to listen to your bf in the sense of his behaviors. He sounds like he enjoys your company and even your kiss and touch. focus on the fact that he said you're a good kisser and offset those automatic doubting thoughts that you have.

Look for those good signs he is giving you, reasons to understand and know you are doing things right and focus on them. What you point your eyes at will always become your reality so look at the things that point you in the direction you want to go. You want security, look for reasons to feel secure, reassurance, as I said, he's given you some, pay attention to that!

Try your hardest to fight back those negative thoughts (lies) to yourself. when you think you're doing everything wrong, make yourself remember what he said or you know you did right (like the kissing) and never ever forget this very important fact: He is with YOU. THAT ALONE speaks volumes to you doing things right

Hope this helps