I don't even dare to ask for a forgiveness

For the very first time in my life. I start to feel if I would ever be forgiven. I don't even dare to ask, and I don't have a right to ask. God said a sinner has to repent to be forgiven. Even I am trying to be good on everything I do, be nice to everyone I met, deep inside, I don't believe I would ever be forgiven. I hurt an Angel who was sent by Him. There is, no way I could ever forgive myself.