From how you describe this, it sounds like a personality issue (rather than acute depression / anxiety), particularly in that your anxieties relate to your self

From how you describe this, it sounds like a personality issue (rather than acute depression / anxiety), particularly in that your anxieties relate to your self-perception more so than your situational perception. The most prudent thing for you to do would be to get a therapist (specifically a psychotherapist, rather than a counsellor or psychiatrist, although the terminology may be different, depending on your location). Rather than simply addressing your symptoms, I think one of the most important things is to understand what's shaped your personality this way. While I expect cognitive behavioural therapy (as others have suggested) would be beneficial to you, I think some amount of psychoanalysis would be very useful in helping you figure out why you have developed the emotional responses you describe. In preparation, I would suggest thinking hard about any adverse experiences which may have contributed to your current patterns of thought. Quite often these are memories which do not initially seem abnormal to us, and may be patterns rather than isolated events.