Ironman666, I know exactly what you're feeling like. I'm 16, and when I was 13 I had a similar experience. My first time, and I smoked WAY too much, the effects lasted for days, and I was afraid it woudl never end. Me thinking that it woudl never end, caused me to have panic disorder and a mild form of PostTraumatticStressDisorder. I just recently started smoking and enjoying it. You just have to calm yourself down when you think you're gonna start freaking out. It works, I just chill and try to control my breathing. On saturday, my friends and I smoked the whole day, until like 3 in the mornning, then went to bed. the next day I felt "off", and a little high, but it's now monday night, and I feel better, and I'm about to go smoke a little bit.
It's really scary, being a beginner, but once you smoke about 3 or 4 times, you know what to expect, like the stages of it, like what happens first, what happens right ebfore you get high, etc... so you know how to handel it. Once you get a wave of paranoia, just calm down, and don't thinka bout thoughts that will make it worse, just think "Let me enjoy this, and it will go away", because even though sometimes being high seems like it lasts a really long time, it WILL go away, it's all panic attacks man. they suck, you just gotta learn to calm yourself down. Hope I helped man.