feeling left out

I feel like everyone in my sorority has already made so many friends/formed groups and I literally have no friends. I try to sit with different people at meals and stuff and make conversation with everyone but everyone just doesn't seem nice or welcoming or will have a convo for 5 min. both of my temp. bigs also don't contact me (one never texted me after bid day and the other texted me one time and then didn't respond again) is this normal to still feel like this weeks after bid day? I liked my sorority during rush but feel so left out and its so hard to really get to know people in pledge classes of over 150 girls. I really don't want to drop but also don't know if I should initiate if I don't love my sorority and feel like I don't fit it :(