My First Big Wedding Cake and Disaster: I Am In Tears!!!

I just finished delivering a wedding cake for 300 people. I was so excited because this was my first truly big wedding cake and I was looking forward to it. Plus the bride and groom were so nice that I wanted to do a really great job. My first problem came with my SMBC; the bride asked if it could be white and I tried really hard to make it as white as possible, using clear vanilla extract, but I guess with all my effort, I could not get it white (I guess with all the butter), it came out a creamy color. I did the gumpaste bow and orchids and I was very happy with them. I stacked the first 3 tiers and decided to put the top tier on when I got to the reception hall. I guess because of the warm weather (though we did have the air conditioner on at full blast), the buttercream became soft as we drove to the event location and the tiers shifting making the cake very crooked. Some of it cracked a little as well. I tried the best I could fixing up the crookedness, but it really didn't work all that much, not to mention that the room was a cream coloring and with the lighting made the cake look even more cream colored. I tried to fix some of the more crooked spots and cracked icing with the orchids, but I was still so unhappy when I left. I just got home and cried my eyes out. I feel like it was such a beautiful location and everything was set up so beautifully and here is this ugly cake that looks like it was made with 2 left feet. I am wondering now whether I should approach the bride first and apologize for presenting not my best work or wait to see if I hear from her. Any advice? The picture of the cake is in My Photos. It is the first cake you see.

Thank you all for your really kind words. I know I will get over it, but it's bothering me so much because I was so looking forward to creating an awesome cake!! I did put plenty of support through the cake and the cake was fridged until we had to put it in the car. I made sure of that simply to make it more secure and car had been cool, so that's why I am not sure what happened. Funny thing is that during the cake tasting I had the bride taste the sweeter buttercream that uses less butter and more confectioner's sugar, but they found it too sweet. I don't know, I can offer myself a whole bunch of excuses, but it doesn't make me feel better. I just keep thinking of how everything in the reception room was so high end and here is this cake that is the 300 pound gorilla in the room. I apologize, I don't mean to have a pity party; I guess right now my self confidence is just a bit beaten.