forgive and forget

I use to always think that if I pray and ask God to forgive me of my sins that I would be forgiven, but it turns out that is not how it works. Someone told me that if you cannot forgive others who sinned against you, how do you expect Jesus to forgive you. A lot of people had said bad things about me in my old school and the teacher always use to make them apologize to me, and i use to say "it's ok"  but I never actually meant it, and then the same day a few bad words use to slip out of my mouth and i use to feel so bad I prayed and asked God to forgive me. My point is that God had not yet forgiven me, because I had not forgave others. So I prayed  and I told God that I had forgiven every sin that anybody has done to me, and at that time my shoulders felt light, like a burden had been lifted of  my shoulders and all of the negativity that flooded the room had been filled with God's presents. At that point I knew that God had heard my prayers and I had been forgiven. So, if you are holding a grudge against someone forgive and forget, you would get the jog of having on less burden to carry around, and once you stay in God he would always take one less burden off of your shoulders.