why do I panic when I smoke weed

Hey guys I'm 15 and I smoked this weed called Blue Cheese and it was in a little blue packet with teeth on the front so I had like 4 hits and I blacked out and when it felt like I was in a dream everything was spinning mega fast and I couldent feel my body and it felt like I was in a movie where I have to find my way home and I kept saying to myself I'm sorry I'm sorry I won't do it again just let me live when I could stand up I couldent feel my hands and I still felt like I was dead my heart was racing extremely fast I said to mmy friends I've gotta go home and they smoked the same sh*t I had and didn't faint they had more than me anyway I was walking home and I seen a ambulance and I just wanted to stop it and get insed because I feed safe when I'm with doctors and paramedics so I kept walking on and I looked at my hands and I was like sh*t son because I couldent feel them and they were purple so I went in my house and shouted mom help I'm dying she ran down stairs like what's wrong I didn't want to tell her but I had to I said I've took this weed and I said call the hospital and I kept saying I'm sorry I'm sorry and I was tingleing all over and it was horrible it has put me off weed eversince then. All I want to know is why didn't my friends faint and feel like I did and why do I always think I'm dead everyday and I have panic attacks almost everyday I also think I'm gunna get cancer or have a blood clot or have a heart attack and I feel like I'm dead because no one knows how its like to die and I think what happens when ur dead because when ur dead that's it its like that for years on end even when the earth is gone that weed screwed me up bad