Problem with text messages

Chances are this happens because you are on a Samsung while your friends are on iPhones. Samsung phones - especially when it comes to texting - don't work very well with iPhones. There isn't really anything you can do except convince your friends and family to transfer to a messaging app (such as WhatsApp) to message you. Once you are using this messaging app your texts will work fine! Sorry about your dilemma, it is frustrating sometimes that Apple refuses to work nicely with Samsung. Good luck!