How to get over fear of bossing

This probably stems from my gaming childhood as I used to be terrified of doing bosses. Dragon Slayer was the first real boss I fought, then Jad (which almost brought me to my knees). I think I have a fear of dying and losing precious things. But I bet the endorphins are up there!! lol I want to try DS2 and Vorkath at some point for the slayer helm. Just don’t know how to get over being scared of this little game.