Can it be normal to feel this way about a new friend?

So recently I had made this new friend at school. We actually first met in September on a field trip and we sorta lost touch for a while and only saw eachother in the hallways at school. Finally she comes up and asks me what I’m doing one weekend and she gave me her phone number. We talked on the phone for a little bit. Before school was out for Christmas break we were planning for her to come over but then she sprained her ankle and couldn’t come. We started talking again and are maybe planning on getting together this week but I’m kinda worried. I like this girl a lot and I do want to be her friend but I sort of feel like maybe I won’t be good enough for her? I mean I’m totally myself on the phone with her but I guess I feel this way because she’s like 2 years older than me. She’s supposed to be a senior in high school but got held back. I guess I’m sort of intimidated by how much older she is than me and the fact how she’s already had so much more experience with things than me if that makes any sense. I basically feel like maybe I don’t live up to that. And sometimes I worry about other things like for example what if she’s one of those backstabbing friends? I worry about that because she once told she really didn’t like this one person then when I’m hanging out with that person she comes up and pretends that he’s one of her best friends and to be honest it’s kind of a warning sign for me because I hate it when people say they don’t like a particular person then when they see that person they’re all nice like nothing’s wrong you know what I mean? I just have these worries. I don’t know what to do to stop thinking like this. Is this normal? What can I do to relax?