Dating is not only about common interests or match percentage; it's also about physical attraction and finding someone who is your "type." If he likes curvy brunettes and you're a skinny blonde, he's just not going to message you back because you are not what he is looking for. In cases like that, you did nothing wrong-- you're just not his type. So why wait around to see if he is going to message back? If someone doesn't respond within 24 hours, they are probably just not interested. Try not to attach to someone so quickly; you literally don't know them yet!