Adrenalin rushes are the smae wether you feel excited or terrified, it's the same boilogical response.The difference is how we interpret the situation or the symptoms the rush causes. If you inclined to worry it is likely you will hate them, if you are quite extrovert the opposite occurs.Speak to your Dr about Anxiety Management advise, or check out NHS direct and it's links on Anxiety, the more you understand the better it is to control. I certainly would not say you have a problem however, you just seem not to like the experience and that is ok.