Well, it seems as if your stuck in a shell. Maybe I'm headed in the wrong direction with this but maybe you need to branch off. I have a few friends who share similar difficulties and from what I personally see is that they never learned their own faults. Many believe that one should find love without having to change who they are, I believe differently. Yes, you should never pretend to be someone you are not but at the same time you shouldn't keep going on as the person you are if it's making you unhappy. Many may read this and completely disagree but look at it in this way, "If the boots don't fit try changing your socks".

Things to look at:
1. You live with your parents - Your 28, wouldn't hurt to find somewhere else to live.
--> Ladies look for a man who relies on himself for survival, in your case a lady will see that you depend on your parents (even if that is not the case).
2. "have no sense of humor or personality" - Take this to heart, it may help in the long run.
--> Find what makes you laugh and go with it, are you too afraid to show your true "sense of humor"?
--> The personality issue just might be because your still living with your parents. It wasn't till I moved out that I was able to truly become who I am today. As you grow up, people adapt to their surroundings and ultimately become a sponge to who/what is involved in their everyday activities. Failure to experience life as it should (branching off to the unknown and being exposed to various surroundings) forces one to never find who he/she truly is.
3. "I'm pretty much a hermit since my parents won't let me go anywhere" - You have only yourself to blame.
--> There comes a point in time where you have to put your foot down to your parents. My fiancée has the same problem, her whole life she has been afraid to speak her mind. She is 24 years old now and still "buckles up" every time her parents speak up. No, I'm not saying to tell your parents to "piss off" but I am saying to voice your opinions; tell them you are a adult and you do have a mind of your own. Jennifer (my fiancée) has allowed her problem to become mine. Her parents are telling her what colors she wants at our wedding and trying to control every aspect of the wedding.

This might not of helped but I felt the need to speak up anyways. I wish you the best of luck and if I was able to get your mind rolling a bit feel free to pm me for further discussions.

*Not sure if you remember me but my old Jsp name was Dirkam.

man up.....