Helping others is not always easy, but it’s always the right thing to do.
Of course, “others” does not mean everybody. You have limits, boundaries and restrictions, and being aware of those is very important for your support to be effective. Similarly, “helping” takes different shapes in different situations, and you will find that what you did to help somebody might simply not work to help another.
Start with yourself, get a solid grasp on your own life, and then relentlessly open up to the others and be present. This might sound like a long way, but it might be the only alternative to “let me know if you need anything”.