How would you feel if I told you I only wanted to take a massage course to feel my coworkers body?
I find that a bit odd. Why do you want to feel your coworkers body so much?
I want to be touched by her and I also love small breasts.
It's creepy to plot a way to feel your co-worker up by using a seemingly innocent method. If you like your co-worker and respect them, then you should just be honest and tell them so. Otherwise they'll think you're a creep for going a roundabout way just to feel them up.
I don't want to be honest because if I am I will get rejected.
I understand you fear rejection, but that doesn't justify what you're trying to do. If you have attraction towards her you should communicate that with her. What you are planning on doing is very creepy and isn't going to help you get any closer to her in the long run.