How do you stay motivated to do tasks because sometimes I get distracted by social media and never finish

I have the same problem, for that I removed all social media access from my computer and work space, when I plan to work, I simply leave my mobile in another room, put on some music and start the task I need to finish.
I have always found that the start is the most difficult part and once you get going, you will finish it.
One more thing if you take a break done try to change your messages, you will end up in a loop and will never get back to work