Me and my boyfriend are going to the cineamas and i dont know what to do?

it is our first time at the cinemas together he has asked me to give him a bl**job and i have just said maybe because i dont want to let him down as i have liked him for about 5 or 6 months he does like things doing for him like i said in the above but i dont want to just hug and kiss him because he will think im frigid please help i am quite shy but i hope this stops sooner or later please helpme