What makes us motivated?

In our life, we try to do so many things. some are close to our heart, some are duties, some are our general nature, and some out of mere obligations. but what makes us really motivated to do all these things? can this motivation be forced into us? Sometimes the same work, i feel like doing it with great interest, no stress, no pressure, enjoying an doing it. Other times the same work i feel like it is taking loong loong time to get done, and i am doing without any interest. how can the same work be interesting one day and not the other? i have to do somemthing to make it interesting otherwise the stress from doing non interesting work would literally kill me. i am that kind of person who would like to do things because i like to do them. so i try to convert my obligations and routine work into something interesting. sometimes i play some music while washing dishes. i long time ago threw away the practice of listening to songs while doing serious work like studying or project because i found that giving my sole attention to the important thing helps me finish it fast. sometimes i do things without motivation and i certainly do not like to blame it on the weather or time or that i am busy with other things. I like to search the answers deep within, and if it is solvable i will be more than happy to solve it and go back to my cheerfullness.

I know i cannot turn back time and go back to my innocent childhood, but i try hard to preserve the meager amount of innocence left in me. sometimes it is hard to find any motivation at all, but u still have to do things because they are important to other people. and there making them smile and feel happy for completing the work is my motivation. sometimes i feel lazy to do stuff which has to be done immediately, there i try to find the motivation in the consequences or in short using fear as my motivation. sometimes i feel like i am trying to constantly consciously do things which should come to me naturally like others, there my motivation is "as i practise more they will come to me naturally". have you ever watched kids when they do household tasks? 

They pretend they are ordering their enemies to withdraw from the war when they throw the trash out. they pretend the beans have small hands and feet and are trying to run away from them and that they should eat them before they get out of plate. they pretend and pretend and pretend to make the mundane tasks easier and interesting, and within no time they would have completed the job and not feel a big deat about it. we could also try this pretend logic sometimes to make our so called adult boring jobs to be more interesting. so either it be a mundane task, or a really interesting one, the main thing to keep in mind is to do the right thing. if u feel it is the right thing to do, then grab any motivation that comes to u or spin any virtual motivation threads and hold on to it strongly. who knows it might work ;)