Not everyone is born with a perky, highly-motivated, and dedicated personality. I happen to be the reverse of all of those.
Then do something about it.
Look, you have a choice here. You can either wallow in the combination of self-pity, self-hatred, and self-loathing that you currently exist in, or you can do something about it. Honestly, it makes no difference what the something is, it just matters that you put one foot in front of the other and carry on with your life.
You might not consider yourself motivated, but one day you're going to realize three very important things.
1) Your life is yours. It belongs to you and that includes the successes and the failures. You must own what you do.
2) You only get one shot at this. There is no reset or undo button.
3) Action, any action, is better than inaction. Moving forward always brings new opportunities and new possibilities and the sooner you act, the sooner your life will change.