Women do not Care About a Man Loves Them
They only care about how much THEY like a man. I am sure you like her, but does she like you? YOU DON'T KNOW!
Remember the key to attraction is...it's not how much you're attracted to a woman, but how much she is attracted to YOU that matters.
Most of the time, men who "gather the courage" to "suddenly tell the girl he loves her" usually do it at the "wrong" time, like when a girl least expects it. Surprises are scary and women don't know how to react. Their NATURAL reaction is to turn you down on the spot ("I have a boyfriend" or "I am not looking for someone right now", etc) just to be safe - even if they regret it later.
So, instead of putting the focus on your feelings and worrying about how you can tell her you love her, I want you to focus on getting HER to tell you she likes you.
The best thing you must do is FLIRTING with her. This will allow you to see if she likes you or not. If she ignores you or doesn't respond well to the flirting, then she's not interested in you. But if she flirts back, she wants you!
Start flirting with her and drive the chemistry up. It's time to ATTRACT her, not to chase her. Your goal is to get HER to fall for you and eventually ask you the "Are we together?" question. Good Luck!