The reason you do not understand the Holy Spirit as a person is because your understanding is of man and not revealed to you from His Spirit.
Any believer through faith in Christ may return to Him through 1stJohn 1:9 and remain in fellowship with God through faith in Christ, thereby allowing the Holy Spirit to perform His teaching ministry.
[1 John 1:3] That which we have seen and heard declare we to you, that ye also may have fellowship with us, and our fellowship [is] with the Father, and with His Son Jesus Christ.
This would have been an excellent time for John to include the Holy Spirit if the triune concept of a God head was being taught by the Apostles.