I have been facing a lot of negativity around me these days. The most of the credit can be given to my negative state of mind, which has started hampering my personal life a lot. Can anyone let me know if there is any Positive Psychology course online, that helps you practice the positive energy?

Something interesting I found:

The importance of discrimination

We don't want our lives to be devoid of meaning, but we don't want too much meaning either. If too many things are meaningful, feelings of overwhelm and complexity kick in, possibly leading to anxiety, emotional vulnerability, and hypersensitivity.

A psychologically stable person is very able to discriminate and does it all the time. It means he or she can give proper weight to things. Proper weight means you can look at a thing, concept, or event and determine how important it is, to whom, in a particular context, at a particular point in time.

"A psychologically stable person is very able to discriminate"
If nothing is meaningful, there is no point in being alive and we speak, again, of a (depressive) personality disorder.

The task we are faced with is creating an optimal balance of meaning. This means we should be able to discriminate between activities that are meaningful (enough) and those that are not.
The fact of the matter is that most people are stuck somewhere between having no meaning in their lives and achieving an optimal balance. They could go with a bit more meaning. This may mean that (1) maybe they are discriminating too harshly and their standards for what can be considered meaningful are too high. Or maybe (2) they are not spending their time on the right things in life. Or maybe (3) they don't know what the right things to spend their time on are for them.