Is it normal too shy to tell my friend that i love her?

I work in an office where there are many attractive women around me. When I started working here I met this woman who was only a little bit older than myself. I was 22 and she was 24. My problem is that I am very good at forming friendships with females but I face terrible anxiety when it comes to showing my true feelings. And I also feel that the longer we stay friends, that the harder it gets for me to tell her that she is much more to me than just a friend. I feel this expectation or burden on my shoulders all the time. The weird thing is that I think she knows that I love her, but sometimes I am not so sure. Some days she will act like she loves me back, and other days she will only act like a friend. She keeps giving me mixed signals. She is really the best friend I have at work. I feel like I can talk to her about anything and be more comfortable around her than around anyone else. Last Friday after work she invited me to her apartment and I was very nervous but I accepted. The whole day I was thinking what she might be planning for me. I didn't want it to be super awkward. We ended up getting some food from Chipotle, playing video games, watching TV, and having beer together. It was very fun but because I had feelings for her I wanted more intimacy. I was supposed to leave to go back to my place but at some point I was really tired and fell asleep on her couch. When I woke up I saw her looking into my eyes and when she saw I was awake she got me a glass of water. I started to get ready to leave, but she insisted that I stay at her apartment and that it was too "dangerous" for me to go back alone when I was so tired and just got up from a nap. I didn't know what to do so I accepted. She had a queen size bed and two pillows so she asked me to sleep in her bed. While I was laying on my side of the bed I noticed that she got up and started whispering in my ear from behind my head. She was so close that her hair was falling in front of my face. She was just saying things like we are best friends and I don't have to be nervous around her and that I can come over to her apartment any time I want to have someone to talk to. I honestly don't know if she loves me the way I love her or just sees me as a very very good friend of the opposite gender, I mean she knows that I'm not gay, and all the signs she is giving off seems to suggest that she does like me. But I am too scared to say anything about that, and I think she knows that I'm scared, but she won't come out and say anything clearly either. I am so confused as to what I should do next.