You're just gonna have to work on your bobbing and weaving, catching shots on your hands and parrying... everything it takes to get inside. You might want to work on some counter punching as well.

If you don't get really good at the above you're gonna be in trouble as people like you are my favourite (if they can't move) as I am 5'9.5 and 140lbs.

If you see tyson when he was in his prime, he moved side to side really fast while moving forward.