I caution you against holding onto the Old Testament too tightly, because it can blind you to the fullness of the gospel and Jesus' all-encompassing grace. Once the grace is given, stumbling blocks fall away, because we join together out of a love for Christ and not an adherence to legalism.
Gal 5:4 Christ is become of no effect unto you, whosoever of you are justified by the law; ye are fallen from grace.
I quoted extensively from the Old Testament AND the New Testament. It is NOT “legalism” to read the Scriptures and seek to learn from them and to obey them. It is what God wants for you as a Christian.
You are NOT supposed to go the way of the lost world, with social drinking, committing adultery, foul language, looking at porn, etc. How often does drinking alcohol cause problems for people? They have even a few sips of wine and their judgement is impaired. It says right in the Bible that Christians are not even to socialize with drinkers! That’s not “legalism”, that’s a commandment to church goers in this age of grace.