Panic attacks

I have been with my boyfriend for 10 months now and he’s my first serious relationship. I’m 18 and he’s my first boyfriend all together.

I love him and trust him with my life, but if we do certain things I’ll be fine one minute and then I start having a panic attack. It’s not that he’s pressuring me to do anything I don’t want to do.

The other night he was fingering me and I was fine one minute and then he went faster and I suddenly just started freaking out. This happens when we try do things like that. He’s very good about stopping immediately and calming me down, but I don’t understand why I keep freaking out so much.

I’ll be fine and then my heart starts racing and I stop him and I feel like I can’t breathe and I usually cry. I’ve gotten better about stopping him sooner but I don’t want this to be a problem.

Is this a problem that anyone else has gone through and what did you do to get over it? I want to be able to enjoy myself without having a panic attack.