I hope I'm not too serious

Too dark,... with all this grey hair, not a chance. I have been told I am sometimes too analytical. But I think that may be because as one of those who found themselves in a S/M and spent yrs. trying to fix it before finally leaving, I sure as hell don't want to miss a red flag as I seek a future S.O. It's an extra cautionary facet that has been added to my otherwise very outgoing and positive approach to a possible romantic interest. I expect most if not all of us are just a bit more reflective when it comes to a future relationship.
Oh and just a bit of collective wisdom I'll impart to you on the "why chasing", assuming you are referring to your S/M. It's rarely productive. And even if you do find or figure out the why as a few do, it almost never changes anything.

Nope. I have always had a dry, dark sarcastic sense of humor, so I KNOW I'm "dark." It's part of my charm, but some people don't understand, nor respond well to it. I tend not to befriend people like that, because I know I will very likely say/do something that will either make them mad or hurt their feelings.

I don't understand.

We are all, always learning and should not dwell on fears of looking stupid by asking questions. Most will admire your strength shown in asking. Many times you are complimenting someone by seeking there opinion and knowledge.

I find myself holding up a mirror,and asking if I sound " dark,intense,worried, a turn off" ,who wants to be around that?

Who do you like being around and what keeps you there?

Last, words mean things. Worry is something we say and do far too much of. How many things we worry about daily that never happen, or are no where near as bad. Think of the word, concern. When you are concerned about something you usually have good reason to be.

I have wondered the same about myself, many times.  I am a seeker and very interested in the psychology of myself and others as well as the intricacies of any situation.  Some would call me quite intense and sometimes, too serious, and almost always, too introverted.  These are traits of mine that used to bother me, that I considered to be liabilities.  However, in my mid-40s and with all the seeking and learning I have done, I am growing to accept myself.  In fits and starts, I am inching closer to genuine self-love - you know that feeling of being totally comfortable in your own skin and accepting yourself, metaphorical warts and all?  Forgiving your own mistakes?  Speaking kindly to yourself?  In my 20s and 30s, I couldn't do that.

I have come to believe that the work of a human life is first - to learn about and to truly know yourself, and second - to accept and truly love yourself.  Some of us will work an entire lifetime and never get there, never even glimpse it.  Others are born comfortable in their own skin.  The rest of us fall somewhere in the middle.  Along with knowing yourself, is knowing what you bring to this lifetime - to those around you.  Once you truly know and accept yourself, then your gifts can shine - and that, I think, is the purpose of life - shine those gifts on others, baby.

Those qualities you see as negatives? I bet, on the flip side, those are actually your gifts.  (In the same vein as Carl Jung's brilliance, 'the wound is the gift.')  As an example, I have struggled mightily with my own introversion until the last few years when I finally realized it is actually one of my greatest gifts.  I am not the girl who will walk into a party and wow everyone with witty banter and party jokes.  I will make a little small talk, I will always smile, but you will soon spot me in a corner locked in conversation with one, maybe 2 others.  And the conversation is deep and it is satisfying and it is intimate.  People open up to me in a way I know they don't with others.  I know secrets about neighbors and casual friends that others don't because I was able to provide that safe, quiet space for them to be themselves.  I'm proud of that and I do believe that particular gift is the flip side of shyness/introversion.  (Along with that, I have a vault that would dwarf Fort Knox - these secrets go down with the boat, LOL.)  

So, I am learning that I am 'that' girl at the party, and not 'the other' girl at the party and learning to embrace that.  We are both awesome girls in our own rights, we just each bring something very different to the table.  

Is that helpful at all?  Oh yeah, being concise?  Not one of my gifts, as you may have noticed!  

Spot on. A big problem for me.