Too body conscious for sex

Summer

My boyfriend is on the smaller size (not shorter) but not too big or broad. Anyway being a teen i know it’s normal to have insecurity’s but I feel so big around him. Like fat. I want our relationship to go to the next level and we’ve been talking about sex but I’m scared to show him my body. He has very little fat on him and I feel like I have too much. I’m 16 weigh 135 and I’m 5’ 6. We’ve been together for 2 months. I don’t Know.. does anyone have anything to tell me that could ease my mind or some advise cause I need to hear it