Should I become a girl?

"So I'm a crossdresser and I love dressing like a girl. I'm honestly kinda a girly girl and I get jealous of beautiful t girls but idk should I become a girl fully?"

From what little you've written here, NO. Only people born transsexual are allowed to transition and to be frank that doesn't sound like you. If there is a LOT more to this see a gender therapist for an evaluation; a list of some can be found here:

http://www.drbecky.com/therapists.html

Transition is not something done willy-nilly or out jealousy. Transition is a long, expensive, medically monitored process that takes years to accomplish.

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No. Do what you love, but be yourself, You are a cross-dresser, not a girl,.

Gender Therapists:

http://www.drbecky.com/therapists.html

Only if you are Transexual.