Me and my boyfriend to have ?

we are both 15, i just turned 15 on march 2nd and he will be turning 16 on march 29th. we have been going out for nearly 3months now i love him with all my heart no joke i could see him being the person im with in years to come. we have spoke about our wedding day and what we're gonna call are kids and everything. i never thought i would find someone as perfect as him he is so amazing and then best thing is he came along just when i had given up on guys. when i first met him i was like oh okay he's nice i didnt want to tell him how i felt or n e thing cos guyss were being stupid idiots for me around that time. anyway i got to know him more and after a month he told me how he felt aand we decided to go out ever since then we've been s good together he is proper amaizng and im COMPLETLY in love with him, i would do absolutly anything for him, say is he died i wuld actually turn around and kill myself. we're so good together and recently i've been thinking about having with him, we've discussed it before and bth agreed we want each other to be our first. of course in a few weeks it will be legal for him to have so thats fine but would it be wrong for me to have , i know it would be illegal but we're in love. we're gonna be safe. i feel kind of uncomfortable about some areas of my body though *cough* bum *cough* i have a few stretch marks and i know he wont care or say anything but they bother mee. so should we have ? what do i do about the stretch marks? does anyone think we should completly nott and wait? thanksssssssss <3