15 Grams First Timer

I was with two friends, only one of them was doing mushrooms while the other one just chilled, smoked cigarettes. We had 30 Grams and split them 50/50. We ate them in my room and then went into the woods which is when the trip started to kick in. Everything started to move as I grew bigger and bigger. We left the woods and went to the shops, almost everything was Lime green and the houses starting caving in towards us. We went into a shop which is when I shrunk, the cans of beer etc where huge and the shop keepers face's were distorted as i attempted to talk to them. We went into a grassy area and just relax, this is when the peak of the trip kicked in. It was about 8:30pm at this time and everything was starting to get dark. I heard people talking but theyre voices did not sound normal, I couldn't understand a word people were saying. I then went back to my house with my friend and sat in my room, my house was huge, the hall's were caving in and my Tv was massive. We just chilled and watched a film... the mushrooms effect seemed to disapear which I thaught didn't last long, looked at the clock. It had been 6 Hours.