As you trusted Christ, the Holy Spirit did several wonderful things for you. He made you a child of God. Now you want to live for God. He also indwells you. “If any man have not the Spirit of Christ, he’s none of His.” So, if you don’t have the Holy Spirit, then you’re not a Christian yet. You become a Christian by trusting Christ, and then you’re indwelt by the Holy Spirit. You don’t have to ask Him in, because He’s there to take the things of Christ and show them unto you. Then, you’re baptized by the Holy Spirit. That means that you have now been put in the body of believers, the church, and you’re in Christ.