While I will not comment on your sanity in a public forum, as the father of a triathlete and a 10K runner (two sons) I will say, from experience, that your shoes are of #1 importance. At your weight, your shoes will not last more than two months (the soles may, but the foundation will break down causing your gait to suffer). Go to a shoe store that caters to elite runners, listen to them carefully, get good shoes (not the best right now, remember they are only going to last for a couple of months) and return to the store after a month with the shoes. They should be able to read the faults in your gait from the soles and wear pattern, and then recommend a pair that suits your running style.
I am a cyclist!