I am a 23 year old in engineering as well ha, what are the odds. Besides the being short thing, I am in the same boat as you. I am in a transitional phase of my life where I am suddenly single after 2 years. I have been on a few dates and have met plenty of girls but I have the same problem of closing. It just takes practice man. Your height only matters if you let it matter. The title of this posts says it alone. Keep you head up and go get em.