Whar should I do 😩

So me and my boyfriend are gonna be a year in like 2 months and we haven't had any sexual activity our whole relationship. And now he wants me to give him a blowjob. What should I don't know I'm just scared of it leading to sex and I'm scared cause my bff told me her cherry poped the first time and she was bleeding. What if he thinks I was on my period or something like her ex did!!!