Ok since you're 16 it's slightly different. Once you get to 18-21 you have to do your own parties.
Ask for one in advance (a bit late now), and help them out to plan it and sort stuff out.
I just sorted out my friend's 21st. She asked a couple weeks in advance for me and her boyfriend to plan it, and then flat out refused to help out claiming she wanted a "Surprise". To be honest she was quite a ***** about it. I've only known her about 4 months and she's only been going out with her boyfriend a month. We don't know who she wanted at her party, or what she wanted to do.
When we sat down with her a week beforehand to go over what was happening she started getting upset because that wasn't what she wanted and we had to, basically, start from scratch less than a week before the day. Even on the actual day she changed her mind about where she wanted to hold it, and also didn't tell me she'd invited 6 more people so we didn't have enough food and drink to go about.
In the future take responsibility for your birthday party. Invite people yourself (being invited to someone's party by somebody else is quite rude), and don't expect people to do a party for you, and if they do don't expect them to read your mind.