I wouldn't exactly call this a fear, but besides being afraid of being alone I'd say the thing I'm a bit fearful about is growing up. Back at home in Cali it seems like a lot of my peers out there are in such a rush to be "grown ups" while I'd rather stay a kid forever. Growing up comes with a lot of heart aches and heart breaks; a continuous rekindling of self-realization that only ourselves can unlock. And although I'm not ever regretful for life's lessons, I am a bit apprehensive when it comes to realizing that things are changing, and will eventually change. Wouldn't everyone just want things to stay the same? Change is good, yes, but it is always and forever going to be the only uncontrollable constant in everyone's lives with the exception of time.
I get really annoyed when people associate being boring and lame to being old (and yes, there is a difference between being old and being a grown up - wouldn't you agree?) I feel that everyone should strive for growth, but I don't find it necessary to use one's age as a means to limiting themselves. Why take things so seriously? We're only given one chance to make as many mistakes as we can until we can't make them anymore, so why not just fuck around and live this one life while the clock tick tocks to our last days.
If I could, I'd stop time - just to enjoy the little moments in my youth for as forever as I can.