I like the whitespace and the simplistic text links. However, as someone already mentioned, having to scroll down to see the design is a downfall. Put the designs (which I like a lot!) "above the fold."
But the biggest problem I see with the site is your presentation. Why are you creating this portfolio? (This is kind of rhetorical; you've already said a major reason was to apply for the DC design team....).
Think of it this way: If you are showing off your works as a designer in order to gain respect from other designers and potentially join a design team, all you need to do is present your work with your name on it. No logo needed. No catchy nickname or business name. Just
your name.
However...
If you are looking to gain clientelle and you want people to take you seriously, then you have some decisions to make. You said:
I can figure out new logo/name for myself [that I really like] every other day or so, but I have problem in "sticking" with one particular logo/name. I still haven't done logo that I can say "wow this is me. There are a lot that look good, but I don't need to change this for at least 5-6 years" 
Boy, can I relate! Picking my business name was one of the hardest things I've had to do. I went through several ideas, and ran everything by a ton of workmates, friends and family. It had to be something I knew represented my work and my personality. Took me a couple of weeks of non-stop conceptualizing and researching (digging through the thesaurus, looking at other designer's business names, making sure the domain was available, making sure other businesses weren't using it, etc.) before BAM! It came to me.
(incedentally, I had to make up a word.

)
So, work at that name. Think like a business person. Will your name be memorable? Is it easy to spell? Can you get the domain name? There are a lot of tips on creating a business name -- look them up and then choose which ones you want to follow.
Lastly, go through your entire site and take out
everything that is self-depreciating. I saw several comments that make you look unprofessional, unsure and uninterested.
example: "Never sent entry for poster design contest I love... Never fixed typo". Fix the typo. Never mention that you didn't get around to sending the design in. Makes you look like you can't follow through.
Go back through your designs and think of everything
positive about that design. Instead of saying "
can't decide which one is best" say "
client and I are working toward the most marketable logo"I hope this helps. You can't be expected to be taken seriously by clients unless you show you have some self confidence and you have put some thought into your business.
Your designs are worth that much effort!

Jess