I think going to confession for the first time is one of the hardest things people do. I know that for as much as I try to put people’s minds at ease, they still worry hugely. But ultimately they get through that first experience and it does get easier with practice. (Though I never find it easy to look at the places I’ve failed and have to admit them to someone else.)
If you Google “examination of conscience” you will get more hits than you could ever use. Here are a few:
frpat.com/examen.htm
scborromeo.org/confess.htm
catholic-pages.com/penance/examine.asp
As you look over these questions you’ll find certain ones that prick your conscience. Those are the ones to confess. If you’re unsure, then feel free to ask the priest to help you figure them out.
Admiring your neighbor’s car is one thing. If it spills over to hating him because he was able to buy it, then that’s something else. As far as I know fertility drugs are allowed so I don’t think there’s a problem there at all (IVF is a completely different matter), but again, you can discuss it with your priest.
Also keep in mind that in order to commit a mortal sin you have to know it’s a sin and choose to do it anyway.
I love the prayer of absolution that is said during confession:
God, the Father of mercies,
through the death and the resurrection of his Son
has reconciled the world to himself
and sent the Holy Spirit among us
for the forgiveness of sins;
through the ministry of the Church
may God give you pardon and peace,
and I absolve you from your sins
in the name of the Father, and of the Son, and of the Holy Spirit.
What does it say about God’s relationship with us and mercy toward us that we use “Father of Mercies” as a title for him? We confess our sins and he gives us pardon and peace. What more could we ask?