HELP! I'm Being Taken Advantage of! What do I do!?

PLEASE READ THE DISCRIPTION. ALL OF IT! What do I do? It's not the same as it used to be. I'm this teen who is sometimes never serious. I'm not The Bossy type of person Though, So I don't want to hear all this oh you'll get used to it. Or It happens to a lot of people you know, Not just you. But When I hung out with my friends, I'm usually the boss if you know what I mean. And when I tell my friends to stop doing something they stop doing something. They used to listen to me but not anymore..... I feel powerless, Useless. Like I lost my Leadership! What ever I say they don't listen anymore and to make matters worst they are starting to take advantage of me.When I was boss I never took advantage of my friends, never.. But now I'm receiving all this bullshit from them. It's GETTING OUT OF CONTROL TO THE POINT WHERE MY MOM HAS TO TALK WITH THEM! (Ex.)So I had a bonfire with them and they put some wood in which I'm fine with that but then after they Took Gardening gloves and Threw them in the fire! Then I told them to Stop! And you know what else they do? They took the lighter that started the fire and Threw it in the Fire TOO! At my house, on my lawn, in my yard. Who the Hell does that?! Oh but that's not all! After that they were too stupid and went in my shed where we store our fire wood and found MOTOR OIL and was About TO POUR THAT IN THE FIRE! I TOLD THEM TO STOP MANY TIMES! TO THE POINT WHERE MY MOM SAW AND CAME OUT AND HAD A TALK WITH THEM! And Then they manipulate me and ask if they could spend the night. I said no. So my friend says "go ask your mom and if not ill ask my mom if you could spend the night at my house" I said "ok sounds like a plan". Then after I asked my mom if i could spend the night at his house she said sure. When I go back and tell him HE CHANGES THE WHOLE DAMN STORY AND STUFF! I can't fit the whole story in but you guys get the point. So HELP! WHAT DO I DO? SHOULD I BE AGRISSIVE? I tried being ASERTIVE AND IT DID NOT WORK!