It happens and happend to me as well.
If you focus on multiple things, you will ended up doing nothing. So focus on one subject which you love.
Basically people gets frustrated and ended up doing nothing when don't put their knowledge into practice. You have to push yourself little bit to put your ideas into practice. It helps .
There is another tips that helps . That is Good Exercise and Sleep. Believe me Good exercise and Good sleep makes your mind fresh, positive always focussed.
Do not bother to think about other's personal issues because when you look at them you will get distracted. That doesn't mean you should avoid news. Actually you should be up to date with lates news.
 and Lastly, No alcohol and drugs.