I'm thoroughly convinced by the scientific, philosophical, and my observational evidence that there is not such thing as free will. Here's a quick recap.
Scientific evidence. Several studies show that it's possible to predict someone's choices a few seconds before they themselves know that they've made the choice.
Philosophical evidence. If you accept that everything happens due to either some cause or randomness, a free will won't explain any decision in your life. You didn't choose your genes, parents, environment, or anything else that determined your abilities, grit and conscientiousness. Everything you do, including making decisions, is determined by a combination of the environment, randomness, and your previous decisions.
My observational evidence. I can observe how thoughts appear in my consciousness. It's especially easy to do during meditation, but it's something I can do by simply turning my attention. Never am I really able to choose the thought to appear. Neither does holding on to a thought seem to be my choice either. Either it stays or it doesn't.
The non-existence of free will should effect how we view justice, responsibility, and revenge. I don't want to talk about that now, though. Instead, I'd like to focus on what it means for your own decision-making.
Even though you're not ultimately responsible for the decisions you make, you should realize that your actions and decisions have real consequences, both for you and for people around you. Nobody follows their first impulse every time, so it's possible to defer action to a later point in time.
Being kind to others and to yourself, and doing good in the world is still a choice that you make. It's just not a free choice. If you can, you should therefore take responsibility for your actions and decisions. You're likely the one who best understands yourself and your actions, and knows both what problems you've caused and how to fix them. The easiest way to fix a messy situation, is if everyone cleans up their own mess, and perhaps a bit of the others'.
I'll summarize my thoughts like this: You ought to take responsibility, even if you're not ultimately the one responsible.