There’s nothing wrong with having a favorite, short, personal prayer. Mine is the Jesus Prayer. But the Lord’s Prayer and the Hail Mary (at the very least) are foundational to Catholicism. It’s also vital to know the theology of the Creeds and the Liturgy (which is "“scripted” for vital and sublimely theological reasons).
I can see why you’re drawn to the Charismatic Movement, with your Pentecostal background. But it’s important not to overemphasize one Person of the Holy Trinity–all are invoked in every prayer and in every thing they do. For example, the Our Father is not addressed only to the Father, to the exclusion of the Second and Third Persons of the Trinity.
Also, best not to assume that just because someone isn’t a Charismatic they don’t experience the working of the Holy Spirit. The Holy Spirit works in many ways (and always in concert with the Father and the Son). All Charismatic Catholics are Catholics, first and foremost, and must understand basic, Catechism level theology and learn Catholic prayers and worship. It’s not optional; it is our obligation.