Do i say the truth?

Things are pretty serious with this guy im talking to. Our parents have seen and spoken to each other. Things are progressing and marriage talk is happening. For some background, I am muslim and this is arranged marriage route where i still have a choice if i want to go ahead or not. I'm not forced in anything and this is something I was looking for so please don't think this is forced marriage situation when it is not. I have been physical with 3 people in my past, i am in my late 20s and 1st guy i was engaged with for 3 years and known for 7 years but spent majority of it long distance. 2nd guy was a mistake and was a one night thing which he lured me in to, i should have known bettee. 3rd was dating for 9 month's but didnt actually go all the way and we werent really active either. This person who me and parents are involved with hasnt had intimacy with anyone and is looking for the same in someone else. I lied and said i havent either because he has seen and spoken to my parents. In my defence i am really inexperienced and my hole has not been open for over a year (that one night stupid mistake) before then its been years! I Also discovered that he watches corn daily and he is aware of what to do but prefers to not have someone who has done it before and be less experienced. I dont know what to do here. Is daily watching corn a lot? And should I back out of this arrangement without saying the reason? Im so worried right now.