Can I add my own voice to TTS and can generate the paragraph with my own voice?

You can build your voice with open source software like Festival or Openmary. You will need a carefully prepared recording of your voice for about 1 hour

There are also commercial services which allows you to build a custom voice, for example Cereproc

Update 2019: These days you can use modern neural network toolkits see Nvidia Tactoron2 and Realtime Voice Cloning