I've been created too many character this week. But I'm always end up creating new character again in next day. All of my created character doesn't suit my playing style.
I've complete main quest, DB, TG, Companions, even Mage College. But I'm always end up creating new characters. Am I some kind of bored or something?
Your suggestions, please. Thanks in advance.

Sounds like you're facing burnout. Put Skyrim down and move onto something else for a month.

I agree. I felt like this recently and decided to take a step back for a couple of weeks. Now that I've returned, I'm back to having a blast with my Mage.

I suggest something like Mass Effect.

Is that so? That's too bad.. Well, alright..
Thank you for your quick response ^^
Mass Effect here I come!

This got me thinking, i have to take a little paus when Torchlight 2 is out i really want that game.

I just did that lol. Next break will be ME2

A week in the big MT gave me the break I needed. Try writing a backstory first, just a general idea of who your character is, and why they do what they do, then maybe the skills you use, and the perks you take will follow from that naturally.

I find a rough flowchart to be useful. Basic decisions: race, focus (warrior, mage, etc.), gender.

Then decide what kind of warrior (to take an example) you want to be. You're experienced enough to know what suits you: sword and board, two hander, ranged, stealth, etc.

Rough out a family background: orphaned, returning to Skyrim 'cuz everyone back in (pick a place) told you that you should "return to your roots;" child of a merchant family from (who knows) sent out on an exploratory trade venture, things went badly, you survived and your guards didn't; runaway slave or indentured servant from (place.) The possibilities are endless.

Is your new character honest and honorable? Underhanded and bereft of emotion? Just plain mean? Helpful, bending over backward to keep the peace, willing to go out of his/her way for others? Natural leader or willing follower? "Ends justify the means" kinda person?

The beauty is that you're in complete control of it. Of course, the game doesn't bend greatly to suit some ideas, so you just pretend. Or, knowing the game's systems and mechanics, stay within those boundaries. If you make a decision, the more fleshed-out it is, the more enjoyable it will be, so long as you adhere to your basic notions (allowing room for expansion and compaction.)

Yup, OP, it sounds like a case of burnout to me as well.

Whenever I get like this, I go and play Halo: Reach for a week or a month. When I come back to Skyrim, it feels fresh and new after that kind of break.

im had a burnout too, so i played the mass effect series for a month or two, then i burned out with those too, now im back with skyrim.

Bottom line: mass effect is HIGHLY recommended by yours truly

Yeah, there is such a phenomenon as too much of a good thing.