Advice!

I'm a 17 years old girl and two days ago i went out with a guy and he walked me home. When we got to my house i asked him if he wants to come in and stay for a cigarette and he accepted. The thing is that my mom saw me and him kissing on the cameras and she got upset but I tried to explain her that i am not doing anything wrong. We are only staying in the back garden we didnt go inside the house and that insted of staying out on the street at least i am staying in the garden and nothing wrong can happen but she doesn't understand me and she got really mad and told me that we are gonna talk and she comes back home which means in two days! I really need an advice please i don't know what to tell her and how to make everything better because we usually don't really speak we only speak about school and basic things but we never talk about what's happening with me, about how I feel or what makes me happy. Advice please!!😁 Tweet