Inhibitions.
My, don't we all hate those dreadful things? Those fears and insecurities that hold us back from chasing our dreams? Everyone suffers from these at one point or another, but people have to learn to go out of their comfort zones and try new things at times. And they have to learn to do this fast.
Wouldn't it be dreadful if there was something you had been trying to grasp for ages, and when you're nearly there, something inside you causes you to hesitate, allowing the said object to narrowly slide off the tips of your fingers? Well, let me give you a piece of advice:
Never give up what you want in the long run for something you want in the present.
Although keeping to yourself in your hollow, closed shell may seem comforting at first, it won't help you to achieve your goals. Throw away that nice umbrella. It's time for you to release your inhibitions; to feel the rain on your skin.