Whatever you are doing right now, you're paying for it with your life. Getting better with allocating time is more a matter of attention management than time management but you need to realize when you are wasting time, and stop it!

The Feynman Technique: How to Learn Anything. Learning by Teaching. With the technique we remember better by actively engaging with the information,creating our own version of it - optimizing for output

Do you really care about the content you are going through on Facebook or Instagram? Does it register? Will you remember what you are reading in 1 month or even an hour from reading it?