Good on you for setting this goal for you self. However I suggest you start small with the goal and work your way up. Approaching 100 girls is a monumental task, for any guy, stutter or not. Most guys don't approach at all anyway despite them being fluent. So I'm rooting for you but set s.m.a.r.t goals. Start with 5 and see if you can do it. Then if you achieve that, you gain confidence to challenge yourself to do more. I hope you achieve your goal of overcoming your shyness.