reff – your heart is in the right place. In a very true way, you ARE already a member of the Catholic Church because you are expressing the baptism of desire. So you are a member of the Church, albeit in a limited way. Now make sure that you find a solidly orthodox RCIA program (not all of them are) and continue in the journey!
From paragraph 1259 of the catechism:
1259 For catechumens who die before their Baptism, their explicit desire to receive it, together with repentance for their sins, and charity, assures them the salvation that they were not able to receive through the sacrament.
scborromeo.org/ccc/p2s2c1a1.htm#1259
Some background info on the baptism of desire:
The baptism of desire (baptismus flaminis) is a perfect contrition of heart, and every act of perfect charity or pure love of God which contains, at least implicitly, a desire (votum) of baptism. The Latin word flamen is used because Flamen is a name for the Holy Ghost, Whose special office it is to move the heart to love God and to conceive penitence for sin. The “baptism of the Holy Ghost” is a term employed in the third century by the anonymous author of the book “De Rebaptismate”. The efficacy of this baptism of desire to supply the place of the baptism of water, as to its principal effect, is proved from the words of Christ. After He had declared the necessity of baptism (John 3), He promised justifying grace for acts of charity or perfect contrition (John 14): “He that loveth Me, shall be loved of my Father: and I will love him and will manifest myself to him.” And again: “If any one love me, he will keep my word, and my Father will love him, and we will come to him, and will make our abode with him.” Since these texts declare that justifying grace is bestowed on account of acts of perfect charity or contrition, it is evident that these acts supply the place of baptism as to its principal effect, the remission of sins. This doctrine is set forth clearly by the Council of Trent. In the fourteenth session (cap. iv) the council teaches that contrition is sometimes perfected by charity, and reconciles man to God, before the Sacrament of Penance is received. In the fourth chapter of the sixth session, in speaking of the necessity of baptism, it says that men can not obtain original justice “except by the washing of regeneration or its desire” (voto). The same doctrine is taught by Pope Innocent III (cap. Debitum, iv, De Bapt.), and the contrary propositions are condemned by Popes Pius V and Gregory XII, in proscribing the 31st and 33rd propositions of Baius.
newadvent.org/cathen/02258b.htm