Life's a fickle mistress, and sometimes she presents opportunities or situations where you find yourself at a crossroad. Do you act and not look back, or hesitate and live with regret? Only you can make that decision, but I will give you this little bit of advice; just go for it!
It doesn't matter if you're crossroad is at work or in your personal life, you just have to act! Because if you don't you'll regret it and live with "what if" the rest of your life, and that is more crushing then going for it and it not working out.
So go ask for that raise, pursue that idea, ask that girl (or guy) out! What's the worst that can happen, It doesn't work out and you're right back where you are now? At least you'll know the outcome and never have to wonder "what if".
I hope everyone has a great and safe weekend!