Need advice..preferably advice from guys!!?

ok so im 17 years old and ive never had a boyfriend, never been on a date, and actually never even hung out with a guy where its just the 2 of is...im a little confused on whats happening. so i couldnt pick up a guy if my life depended on it and this is making me very depressed. I always act myself (which is nice and polite) around guys, I also try to wear good looking clothes that are flattering on my body (not slutty or hooker looking like most girls), overall i have a well put-together and clean look, yet guys never try to start up a convo with me, or even look at me for that matter and i dont get why. dont guys always say theyre looking for girls they can bring home to their parents? yet they go and get with the slutty girls and end up dating them...i just dont get it. I know its something about me because its not just one guy doing this, its all guys. I feel like guys might look at me and think "oh i can do better" but what can i do to get more guys to notice me? Ive heard some people say you have to learn to love yourself before others do, and since i dont love myself, could that be a reason why guys dont like me? can they sense that or something? I dont know what im doing wrong..or am i just that ugly that i have to accept the fact that ill never get guys? someone please help and give me advice!