It is good that you realize you have drifted away from the Lord; this is the first step toward enjoying a renewed relationship with Him.
We have the assurance of God's Word, "If we confess our sins, he is faithful and just to forgive us our sins and to cleanse us from all unrighteousness" (1 John 1:9). Come to Christ, confess and turn from your sin, and He will keep His promise to forgive and cleanse; see 1 John 2:1. He further promises that He will not only forgive, but He will also forget; see Romans 8:1 and Hebrews 8:12. This is your opportunity to begin life over again and to walk with the Lord in daily fellowship.
The Holy Spirit gives us direction when we fully surrender our lives to Him. He has promised, "I will instruct you and teach you in the way you should go; I will counsel you and watch over you" (Psalm 32:8).
Ask God to help you give Christ first place in all things, and live according to 1 Corinthians 10:31, "So whether you eat or drink or whatever you do, do it all for the glory of God." Daily Bible reading, prayer, and fellowship with other believers in a dynamic Bible-teaching church will help you grow strong in your renewed faith.