Being successful in life needs a primary quality in you. Yes, you need to have the right attitude i.e, a positive attitude. Always try to look at the positive side in every issue you see while not ignoring the negative issues. Always look for ways to get positive results out of every effort you put.
Even when you fail in your first few attempts, try and identify some learning out of every failure and use it as a stepping stone for your future attempts. Focused learning at every stage with retention could help you in improving the success ratio in all your future attempts.
Also never lose focus on your core goal and keep marching towards that with perseverance. And success does not come to you easily, and every hard won success would help you to cherish it more and also for a longer duration.