I don't understand?!

Cash • I'm 14 years old, going on 15 and I have many questions about my body and how it works. Please don't judge.
So my boyfriend and I have had sex (please don't turn the topic into "you're too young!" Okay yeah whatever) and he's actually really pretty big. We have done it a couple of times but I haven't bled due to my hymen breaking. Do I just not have a hymen? Why haven't I bled? I don't understand.