Thank you for raising this, paintedgoldfish, and God bless you in your quest to be yourself and find a church that accepts you as God made you.
To your question, can you be gay and a Christian, the answer is simple: yes.
To the question, can you be in a practising gay relationship and a Christian, my answer would be equally simple: yes.
I won't go over the Biblical arguments; undoubtedly there are a few verses in Leviticus and Romans that condemn some sexual practices that might be same sex: as other posters have said, there are scholars, e.g. Jeffrey John, who have argued that these refer to temple prostitution, orgies and the like.
But for those who insist that the Bible condemns homosexuality, can I put in a plea for consistency? The Bible also condemns eating shellfish (Leviticus 11) - so please ban prawn sandwiches from your churches as well as gay people. The Bible also says that adulterers (both male and female) should be put to death: get the stones ready, folks. It is ok to have slaves (Leviticus 25) provided you take them from other nations than God's people, so William Wilberforce was obviously wrong. And in case you think I'm just referring to the Old Testament, remember that those slaves should obey their masters (Ephesians 6). Oh, and I hope you don't let women speak in church: St Paul would never approve (1 Corinthians 14)!
If anybody's irony radar is malfunctioning, I don't actually believe in slavery, stoning adulterers, or avoiding prawn sandwiches, and I worked quite happily with our female vicar until she moved on recently. What I don't like is people arbitrarily taking some Biblical passages that suit their homophobic prejudices, and conveniently forgetting how problematic it is to take the Bible as a simple lawbook for Christian living.
Either accept the whole lot if you can, or else accept that God's scriptural word to us is found in the whole sweep of salvation history, focussed in Jesus' opening the Kingdom to Zaccheus, Simon the Leper, Mary Magdalene and others, and not in individual phrases taken out of context and used as magic oracles.