What do you recommend I do?
Start off by reading a good summary of teaching - say the Compendium of the Catechism, or Catholicism for Dummies (by Fr John Trigilio - ignore the unfortunate title, it’s a good book).
Not necessarily from cover to cover, but beginning with the claims the Church makes about the bedrock issues - firstly about the meaning and purpose of scripture, and the Church’s claims about the nature (and extent) of Papal and Magisterial authority and the relationship between scripture, tradition and the magisterium. As a lot of people tend to find that once their grasp on these concepts is firm, a lot of the rest tends to fall into place.
Supplement this with the full Catechism, being careful to also look at the footnotes. They reference various passages of scripture as well as more detailed Church documents - read everything that is footnoted to flesh out the bones of the Catechism.
The Compendium, the full Catechism and all the papal documents should be available for free online - just google the titles.
Then move on to the sections of the same works that deal with any other topics you have queries on - perhaps teachings on sexuality, Mary, the Eucharist or what have you. Supplement your own study by coming here and reading the library on these topics, or asking questions on the forums if anything is not covered elsewhere (search first - a lot of topics are done to death).
Realise that you might doubt and disbelieve, just as many doubted and disbelieved Christ Himself when He stood before them bodily and taught and worked and preached. Their doubt and disbelief did not mean He was wrong, nor do yours necessarily mean the Church is wrong. Accept that it is just as likely (if not more so) that you are lacking in the deep understanding possessed by a 2,000 year old institution that stems from the Apostles themselves, whose leader is of direct lineage from St Peter, than that that institution is wrong.
Above all this, LOTS of prayer for a humble, Godly wisdom. And the same attitude that St Augustine, a brilliant thinker, had. That first we seek to believe, and only then to understand, and that there are many things about the faith (not just Catholicism but Christianity) that are incomprehensible to mere human logic. Things like the Incarnation, the Trinity and so on.