Yes, I’m 100% sure of heaven.

Yes, if you truly trusted the Lord Jesus Christ as your Saviour you are saved. You can claim the promise of Jesus Himself:

And I give unto them eternal life; and they shall never perish, neither shall any man pluck them out of my hand.     John 10:28 

As a child of God you should now remember several things:

Be baptized.    Acts 2:41
Attend and join a fundamental, Baptist church.    Hebrews 10:25
Study the Word of God privately as well as under a Godly teacher.  2 Timothy 2:15
Win souls to Christ and bring them into the Local church.    Proverbs 11:30

If we can be of any help or assistance to you please feel free to visit or contact us.  We would love to hear from you and help you in the understanding and practice of the Word of God in your life and family.