Recently I started running (never ran before for longer than 1 or 2 kilometers, or maybe just few times). After 2 weeks of 3x5 Km plus last time 8 km my right knee started hurting so I stopped. The pain disappeared after few weeks of no running but directly came back when I ran again once for 4 km. Then I discovered that the shoes I had caused that pain even when I used them for walking to the next convenience store. So I went to an Asics shop, made a foot test and discovered that I had a severe overpronation combined with heel strike. I bought stabilizing shoes and tried them once but some of the pain came back during the running. 2 days later I tried to run and focus on landing on Midfoot . The result was great, ran for 3 km and no pain at all.
Now my question is:
I want to adopt this running style, but when I run with it, I can't control my speed and start running a little bit faster, which makes me tired faster. So how is it possible to change one's running style without having to focus on it during running. And is there a way to reduce the overpronation?
I am 187 cm tall and my weight is 91 kilos.