You cannot put your voice into vocaloid. But you can do it with Utau. Why that two sentences are different? Because Vocaloid and Utau are different! UTAU is in no way affiliated with Vocaloid. It's engine was developed by a group of users, and not YAMAHA, or CRYPTON, the creators of Vocaloid. For further explanation just click at this link and read just 'What is Utau?' part.
TUTORIALTo put your voice into Utau, you must make a voice bank first. Voice bank are some sample of your voice which will be used at Utau.
Here's the tutorial how to create an Voice Bank I've found. Not really detailed. But maybe it can helps:
First, you must record your voice. When it comes to recording I always suggest making each sample 2 seconds long and using the program you are using to record (Audacity for me) to fade out a little bit of the end.
If you are looking for a relist (a list of things to record) I just searched hiragana on Wikipedia and recorded according to that.
You want to save all of your samples in the same folder, just remember that.
When importing your samples in to UTAU, click T then O then the second tab in the pop-up menu.
You will see a large box then two smaller input boxes below it.
The bottom-most input box has a button to it's right, click it.
Find the folder that your UTAU samples are in then click on one of your samples then open.
In the input box above the one you just used, is where you put the name of your UTAUloid then click the left most button on the right of the box.
The right most button is the delete button.
Click OK when your are done with this.
Now you have to make the .frq files.
Click T then S (or ctl + G) and a pop-up menu will open with all of your samples listed.
You will have to click sample individually then click the second button to the right.
Click okay on the pop-up then wait.
When you are done waiting, a little circle will appear on the right most part of the large box under frq.
You will have to do this for each sample you recorded.
Once all of the samples have circles, click okay at the bottom of the box.
You can start using your UTAUloid after that.
-Thanks for Mikau for this tuto (-__- )