Most people acquire their money honestly. Usually by earning it though working. Sometimes through gifts from others, such as an inheritance or generous parents.
The money your earn with your work represents what others voluntarily are willing to spend for your services. Suppose you have a job. People enjoy the opportunity of paying money in order to receive your company's products. Because you contribute to that production you receive part of that money. In turn you use that money to buy other products. The money is a trade facilitator. What it comes down to is that, through the market, you have traded your services for those of others. If you make a lot of money, apparently your services have been very valuable for others
In any case, your earnings do not come about at the expense of others, because all those other people voluntarily take part in the trading system which we call the economy and they do that because they believe they benefit from the cooperation. The economy is not a zero-sum-game. The fact that we in the west are rich is not the cause of poverty in the third world. The fact that you make a lot of money is not the cause of someone else being poor. So there's no need to feel guilty about your riches. That doesn't mean you may not feel sorry for others. Of course you can help others and it is good to do that. But one should look upon helping as something one does voluntarily out of goodwill, interest and concern for others. Not as something you have an obligation to do and about which you should feel guilty if you don't do it.