age difference

He's older, I'm intimidated and unsure

luv_cool_gemini asks:

I am a 15 year old girl and I have a boyfriend who is 20 we are going out for about two months we both love each other and till now we have had only one private moment were we smooched and he touched my breasts after asking and he tried to touch my privates like he just placed his finger there but he didn't go inside I told him that I didn't like it so he withdrew when we smooched again he took my hand to his penis but I jerked it off . We both are true to each other he has got a blowjob once from a girl n he has also fingered her and I too have given a blowjob to my ex but I am scared if I get pregnant and I also can't tell him to use condoms because he doesn't like it he also tells about having sex with me but I am just fifteen so what do I do? I also want to and don't want to give him a blowjob because I am scared that I will get pregnant and will he think wrong of me if I give him one? Because I don't want this relation to break.