Is it normal for my girlfriend to get me out of depression?

Before I met my girlfriend I was shy, insecure, had low self-esteem. I was also going through a state of depression. I don't know why she wanted to be with me because I didn't have anything to offer. But even though she was outgoing and confident, which intimidated me, she had a side that was sweet, gentle, and caring. She made me feel better about myself, she gave me the confidence I needed to turn my life around, I began to look, feel, think, and even dress better. I started to feel better in mind, body, and spirit and I became more productive at work and other parts of life. I even started to get attention from other women which had never happened before. My girlfriend noticed and she even joked that she was jealous that other women wanted me. But I really owe her and love her so much. I just want to say...Nikki, you will always have my heart, and you will always be my Buttercup.