I am also gay, but learnt that wondering why I am this way is pointless. Maybe it's genetic, maybe it's nurture, most probably it's a mix. Whatever the cause, God allows it and therefore He must believe that it can be used for my good and His own glory. The reading from the Epistle at Mass a few days really struck me: "My grace is sufficient for thee: for my strength is made perfect in weakness. Most gladly therefore will I rather glory in my infirmities, that the power of Christ may rest upon me." So just know, even if it's hard, even if sometimes you'd rather be in a different situation, God's grace is sufficient and He has allowed this so that He can work in you.

Secondly, know that same-sex love is a very good thing. A beautiful thing. Some Catholics in their zeal try to pretend that there is absolutely nothing positive in homosexual relationships and this is evidently ridiculous to anyone who knows a same-sex couple. They care for each other in sickness, they share life together, support one another in difficulty. This is all very beautiful and, in my experience, it is what Catholics who experience same sex attraction fear they'll miss out on in a life of celibacy, much more so than any worries about not having sex. But God nowhere or ever says that two men or two women loving each other is a sin. The bible is full of such relationships: Naomi and Ruth, David and Jonathan, Christ and St John - the 'disciple whom he loved'. This love, however, is properly ordered towards friendship. Our culture sometimes thinks of friendship as a second tier relationship - we're just friends - but that is not the Christian view. Christ Himself holds up friendship as the model of love when He calls his disciples not servants, but friends. So often we speak of the situation people like us are in as only a trial - a cross to bear - and while that is partially true, it's even more true to always remember that you're not called to a loveless or lonely life. On the contrary, you're called to a life of deep intimacy with God and with others.

Go to Mass frequently, forge strong friendships, take your anxieties and worries about the future before the tabernacle, and trust that the God Who is love will shower you with all the graces you need to lead a life of love in this life so that you can be united with the One Who is Love in the next.