I like to wear women's lingerie. It makes me feel attractive. I'm so confused. What could this mean?

It doesn't necessarily have to mean something specific, maybe you just really like it! Gender is a set of social constructs that are associated with being man or woman, but these norms are arbitrary and not fitting into a certain box doesn't necessarily mean that you fit one gender instead of others. You can like crossdressing and be a man, or it can be a signal that you have a more feminine side in your gender identity, there are many possibilities and there is no universal answer. It's all about how you perceive your gender and what this type of crossdressing means to you - it might be a hobby, a kink, just something that feels good, only you can determine what it means to you. Just remember that social norms don't have to dictate how you view this.