I (24F) helped a homeless couple (F30? M30?) and now I’m getting harassed if i don’t keep on sending them money

Edit: Many of you are right, i was being a doormat and need to learn how to put down boundaries. I have blocked them now and hopefully this is done. For everyone concerned about my personal safety, thank you, luckily they know very little about me in ways of my personal life so I should be okay there. Thank you all for your advice, this has been a big learning curve but I will try my best to stand up for myself in the future. By all means, continue to help others but not at the detriment of yourself. God bless