Experience - Experience can be a great teacher or it can cause us to default to previous responses when dealing with totally new circumstances or people.
If we don't learn from our experience we can't use it as an effective tool to improve or change for the better. Negative experiences have a significant impact on our attitudes and until we are willing and able to evaluate them maturely and accurately we are destined to continue to repeat similar behaviors in completely new and different situations.
Mindsets - Think of a mindset as cruise control. Once you press the button everything happens automatically.
So, if over time you have become a negative or pessimistic person it is easier to think this way about everything than think otherwise. Attitudes are driven by mindsets.
If you have any prejudices as a part of your attitude base you will tend to think and act this way regardless of current circumstances. Mindsets are one of the major factors that contribute to our attitudes whether it is your attitude about time, weather or any other human factor or interaction. To change attitudes requires that you change a mindset, but I'm sure you realize that because of an existing mindset this can be a very difficult if not impossible task.
And why? Because most people would rather remain the same than do the work to change. The other reason is that when we have certain attitudes we will go to great lengths to defend them as right or appropriate.
Personal history - Your personal history; how you were raised, values you were given, beliefs you have developed over the years are a significant factor contributing to attitudes. If you have consistently failed over the years regardless of the activity or endeavor, if you have not come to see these failures as a valuable learning tool but a reason to bring this philosophy to any new action you will tend to continue to repeat these outcomes.
You can't change your history, but you can change how you choose to interpret it in your present moments in present circumstances. It is a choice, one that is vital if you want to change any attitude.
Expectations - The number one cause of disappointment are unrealized expectations of either yourself or someone else or even a situation that does not turn out the way you hoped or planned. Expectations are simply what you want to happen or when or how you want someone to act or behave. These expectations are generally grounded in your personal attitudes like - people should be on time, the weather should cooperate, stupid drivers should stay off the road while you are travelling, planes should be on time - got it?
These are simply personal beliefs that you have that have developed over time that are then manifested through your expectations thus reinforcing your attitudes in this area.
Conditioned environment - You were raised in an environment you couldn't control. All that your parents or caregivers could pass on to you were their beliefs, values etc. Although these might have been appropriate for them given their circumstances it is unlikely that some of what they passed on to you is still relevant in today's complex world. What you learned from teachers, church leaders, relatives, or even neighbors was "where they were coming from in their life" but it has no relevance whatsoever to the decisions you face and the choices you must make in your life.
Education - Education can be a significant factor when it comes to attitudes as what we learn, who we learn it from and how we are trained to apply our learning can impact views, opinions and beliefs and how we execute these.
Your political influence is driving many of your views, prejudices, opinions and values. I am not implying that any of these are wrong, right or neutral just that they are impacting your attitudes. Yes after our early educational influences many people change their views, but this is usually due to continued neutral and impartial ongoing education.
Perceptual interpretations - Everyone filters what they hear, observe and experience through a very personal and unique mental emotional filter. Let me just conclude that the ingredients in your mental filter, things like; expectations, age, gender, race, religious beliefs, cultural background, education etc. all have contributed to your opinions, interpretations, beliefs, values and yes prejudices.
Yes there are many more contributors to a person's attitudes, but I'll wager that most of your current attitudes can be measured using the above topics as your template.
I'll leave you with a question - are any of your dominant or primary attitudes getting in some way sabotaging your success, happiness, inner peace, relationships, career or any other life area