Insecure

So I am a freshman and lately I've been feeling really insecure about myself. Whenever I'm with my friends guys approach them and talk to them and ask for their numbers and stuff and when I try to talk to the guys they just ignore me it's making me feel very insecure as if no one likes me. Or I'm really ugly have been battling this for about 1 months and I feel like I just need to talk to people about it but also really sucks is I found out I have chrons disease. Just passed Month been really hard. Now I'm just completely Doubting is I am pretty or ugly or just nonexistent to guys. Thanks