Every person does have the pre-ejaculatory fluid (AKA Precum) but the amount differs from person to another.
You are one of those guys:
1- If he think about sex, he will dribble precum.
2- If he think about sex, he will see a few precum on the tip of his penis.
3- If he think about sex, Precum will not come out, but he must masterbate/get more aroused to see some on the tip of his penis.
4- Neither thinking nor masterbating will make him discharge precum, but he needs to get very close to climax to see some.
Summary: Every man got it, but the amount differs.
It is very normal for a person to have few precum, besides, many men prefer to stay like that because the chance to imprignate a woman is very low.
I myself don't have alot of precum and happy with it, stop thinking and having such doubt about yourself, you are a full man and your body is fine.