The same goes for your positive or negative) thinking! The more you do it, the easier it gets and the stronger your propensity for such things are. It therefore stands to reason, if you've been negative most of the time, those neutrons will be more active and it is possibly going to take a greater amount of effort to make positivity your more natural way of being.
So get on it asap! We are creatures of habit and heuristics, so all you need to start doing is carving out more ways of being upbeat into your life. Make those connections stronger and you'll not only start to feel better, but by the nature of Law Of Attraction you'll start bringing to you more of what you want.
And doesn't it feel good to feel good- it is the primary motivator after all.
So try it- even five minutes a day of deliberate practise and focus can go a long way in bringing about an uplifted life.
All is well!!!
Happy pathway-ing!!!
Lots of love, Nick Xxx