Your boyfriend stick it in but how can you know if am not a virgin no more?

It depends on what you mean by "virgin." Technically, if your hymen's been broken, you're not a virgin, but hymens can be broken by intense physical activity without any help from a boyfriend. If your boyfriend stuck it in, in my opinion you're no longer a virgin. But some people would say you're a virgin until he actually ejaculates.

I'm worried from your question that you don't know enough about your body to be having sex. Get a copy of Sex for Dummies (Dr. Ruth Westheimer) or Our Bodies, Ourselves and educate yourself, quick!

Please be careful, okay?