About my psychological type based on my naiveté...which shames me.

Okay... I realized today that I'm a very, very naive or stupid person... basically, I'm someone who can't say no easily...Although after much analysis I realized that my "friends" take advantage of my kindness....Basically, my cousin made a proposal I was going to sell my Sheldon box to his girlfriend... but I didn't realize it that day, and I'm incredibly slow... a week later I understood from my family...That the "deal" was unfair...that I was naive once again...Basically, I would pay his girlfriend 400... and I wouldn't receive anything, with the excuse that just receiving the box in better condition than Sheldon was enough...I was stupid, and to keep things on good terms with my cousin, I was nice and accepted it...that's how I am with people...I'm polite to most people...but I prefer to stay quiet...to think I'm being used and not realize it....It's frightening to me.