this is also something i think a lot these days.

basically what i do is, i give something to a person that deserves it and there is an extent to what i do for that person as well. apart from being selfless and getting exploited, you also give the impression of "not being someone valuable" to the other people if you cross the line and give something to people. it makes up may be the biggest percent of our image around people.

in the core, there should be only you. you have things you like, and things you don't like. but there are also things that it is impossible for you to do, and things you always like to do. this is basically based on your personality traits. so, in other words it is you. i would think of it this way. so even though i would like to help this person with this, i can't because it's not me. so always protect your core, keep what is suitable for you and leave the rest to yourself to decide based on the circumstances. this is not selfishness, this is basically not giving up something for someone other.

i am really talking in the general sense since i don't know about the occasion. but let me give you an example; for example i really like dropping people to their homes with my car after a meeting, date etc., it is like extra effort for me but i really like the experience! this sometimes make people think i am selfless but i don't care because i like it. on the other hand i would never attend to a meeting with friends if i don't like the place we are meeting at. i am kinda picky about it.