There are many ways to express your feelings to a girl in English. Here are some romantic phrases you can use:
1. You are the most beautiful girl I have ever seen.
2. I can't stop thinking about you.
3. My life is so much better with you in it.
4. I am deeply attracted to you.
5. You make my heart skip a beat.
6. I cherish every moment I spend with you.
7. I am grateful to have you in my life.
8. You are the reason why I smile every day.
9. I am falling for you more and more each day.
10. I want to hold your hand and never let go.
Remember to be sincere and genuine when expressing your feelings. Good luck!