>But sometimes I wonder why I can lose friends so fast by just saying things that are true or are very likely to be true.

I am like you. However, I hold the old quote to be true: "People may not remember exactly what you did, or what you said, but they will always remember how you made them feel." It doesn't matter if the things are true or not. You stating those things makes people feel scared, worried, and/or defeated. If you had those feelings when another person was around, how often would you want them around? This is not a criticism but simply another viewpoint.