Relationship Advice

So I went to my friends house earlier and I got home at 3:00 and I left my keys on the balcony so my brother could reach them and my dad got mad because I was gone at Mia's to long but my brother lost my keys and he blamed it on Me. So my brother sat outside for like 5 minutes and my dad got mad at me because he thought I lost the keys when it was really my brother... So now I can't go anywhere this weekend and I have to go to my grandma's the whole weekend.. Staring Friday. 🙄 My parents told me that I wasn't aloud to hangout with my boyfriend outside of school.. I'm 16, He's 16 and we're juniors in HS and I don't wanna lose him.. but idk how I'm gonna keep our relationship if my parents won't allow me to see him outside of school...