I eat meat, but girlfriend is vegetarian. Can this work?

If you walk into a marriage expecting that each person is going to give 50% and that will get you there, you should go ahead and start building a relationship with a good divorce lawyer, because the first time you have any misperception about where that 50% mark lies, it will all start to crumble. This will happen extremely early too. You need to be prepared to give and do anything to support that marriage. So does she, but that's not your concern. Once you find it within yourself to do and be whatever she needs to make the marriage work, then you can take another look across the table and decide if she's the one who is worth all that.