<human>: Can you condense the text into a few key points?

Last Saturday I told her "I love you" and after explaining why I felt that way she said "I love you" back. But I feel like we took too big of a step now. Instead of lifting our spirits its put a weight on our conversations and relationship. 
I can tell its bothering her, and its bothering me now too. I am going to talk to her later today, and I want to bring it up. I feel like she only said it to please me, and now I'm doubting what love truly is. I want to make our relationship go back to before we both said it, and maybe we can laugh this off. Wait until the relationship really matures and then give it another go at "love".
Please help. I need advice or I might f*** this up.
<bot>: Said "I love you" to gf, feels like it was too soon. She is acting awkward. I'm thinking about backtracking. Need advice