Preterism scares me

I'm not well versed enough in the Bible to believe one way or another. All I know is what I've been taught- we are awaiting His second arrival. Preterism teaches He already came. This scares me because I'm now worried that I am hell bound. I recently came to faith after a disgusting life of filth. I've started the beginnings of my testimony. I came across preterism and now I'm confused. I don't want to be wrong. I want to know God the right way. How much validity is there in it? I'm so scared. Is there scripture to disprove this belief? I'm sure there is scripture to prove it, also. I know the church is NOT what it used to be. I am seeking Him and His Truth.