Screwed myself over big time. Suggestions?

Alright, well I've got this boyfriend. We've been going out for 2 months. I'm 15, he's 17. I say, "Hey, how about I stay over? That should be fun." Then I told Mom I'm staying the night at my girlfriend's house. She says, alright, call me when you get there. So I ride my bike there, call her, then leave and go to his house. In the morning, I didn't answer my phone when she called, because I was half asleep, so she called the phone at my friend's house. Then she talked to her Dad and found out I was never there. I told her the truth and went home earlier than expected. Now, my Dad who was willing to meet him says, I can't have a boyfriend. He won't meet him, he'd have to try to prevent himself from killing him. Mom on the other hand says MAYBE if he apologizes "sincerely" I can see him once I'm ungrounded. Both parents want me to be grounded at least all Summer. Now, I know the legal implications and everything. I'm not on here to get lectured. I HAVE to see my boyfriend. I need him. He's the only person who understands me. Don't argue, just pretend it's true, because you don't know us, 'kay? It just depresses me because I used to be able to see him almost every day but it's been about a week now and it's terrible. I just wish I knew how to convince my parents, or at least, my Mom, to let me go other there more often, again... or what can I say/do to convince my parents? I'm doing the best I can, but want to know if there's anything I haven't thought of.