Women-is this normal?

So im 15. And my boyfriends 18 and he doesnt have the smallest fingers. And we were watching a movie at my friends house and i had no intention of him doing it, but he started me. The first time he did it it was okay. Then this little boy came down stairs and he had to stop. So he did it again for a while and it was still kinda okay. They said i was moaning but i dont think i was. Then he did it a third time and i started sqirming cause he was going deeper and faster and i was breathing really irregular and fast and he said i was shaking. Is that normal? It was my first time with anything in there.