Anxiety - a crippling disorder?

I've suffered for as many years as I can remember with anxiety problems. It is horrible. Even years after an incident happens, I still can have residual anxiety attacks. The incident can be something simple and mundane to most people, but I end up anxious. Having a residual attack can be embarrassing - especially when it is triggered by something tiny (or unnoticeable to others). The attacks can also happen at the mere thought of doing an activity I am unsure of, or afraid of. Telling me to "get over it" or that there is nothing to be afraid of does absolutely nothing to allay my fears - rather, it makes me angry. Sometimes I get scared of trivial things and shy away from them like a scared child. I don't mean to - but I do... and I hate it.