Cheap sentiment is one thing, vulnerability is another. Allowing yourself to stand emotionally exposed before yourself and examine your own emotions is allowing yourself to feel; it’s allowing yourself to experience your own humanity, it is doing what you’re exactly supposed to be doing. Only thus you’re being a person and only thus you’re being what you are. And if you feel you’re being/are vulnerable, then you should embrace that, not shake it off. You might as well trust it fully.