I'm so angry at myself

I messed up big time. I told Sarah that her new haircut looked good, but honestly, I hated it. It was awful. I don't know why I lied. I guess I just didn't want to hurt her feelings. But now I feel like a terrible friend. She probably thinks I'm a fake. I should have just been honest, but I chickened out. It's not like the haircut is permanent or anything, and maybe she would have felt better knowing the truth. Now I'm just sitting here stewing in my own guilt. I keep replaying the conversation in my head, wishing I could take it back. Why am I such a coward? It was just a haircut! But the lie feels so much bigger than it is. Ugh, I hate this feeling. I just want to be a good friend, but I keep screwing things up. I need to find a way to be honest without being a jerk. This sucks.