New to dom/sub dynamics

Hello sir, I’m a 20 year old sub that’s new here just recently followed and I’ve recently entered into a dom/sub type of relationship. I’m obviously not well versed in this area due to being new but my dom is saying I don’t have choices anymore now. I understand that but it makes me a little nervous but also excited. He’s also asking me to push my boundaries ie he asked me if I’ve ever done watersports and I told I hadn’t and wasn’t sure about trying it. His response was we are gonna change that and I don’t really get a say in it because I’m a sub who needs to owned by a man. It turned me on a little but also just wondering if that’s how it usually is and what other things I should expect coming? Idk I’m just overall a little nervous any advice would be great appreciated thanks for reading.