I challenge you to want others less fortunate than you to succeed even more than yourself.
If you want to be of influence, then you have to make yourself the best, most knowledgeable, most strong, and then the only reason to make yourself knowledgeable and strong is so that you can better influence and help others.
Are you sincerely happy for them, when someone else does better than you? If not, then you are not selfless.
If you help yourself, you only help one person, but when you help another person your influence is immeasurable.
You cannot help anyone else when you cannot help yourself first.
In fact all things are a selfish act, even being selfless as that is what you want: therefore, the true act of selflessness is not doing what you want, but what somebody else wants.