I can be suspicious at times, either because I have some doubts about different things or just for some sudden precaution that comes to my mind by chance,

You're on point here and I totally agree to this. I'm also confident in people sometimes and relate very well but I'm very self assertive and won't give out vital informations to people until I've created a strong bond or till I've examined properly the person's character and ability to take secrets and also the person's manner of approach towards things.