Is my bf too big? 😉🍆

(I know that title sounds stupid and im not bragging i promised 😂. I just need advice!) So my boyfriend and I haven't had sex yet and I'm still a virgin but I have a dildo/ vibrator thing (it's called the Mr.Right Now and he's pretty awesome) and it's 3 inches long (insertable) and I feel like it fills me up but my boyfriend is 7 inches? Should I be scared? I don't want it to hurt and I know he's worried it will hurt me. I'm also conserved if I'm going to be able to come since the G spots only like 3 inches inside. Should I be worried? Any advice would help!