Can’t gain weight, help !!

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Hi I’m 19 years old, 5’3 and 45.5kg, I’ve been trying to gain weight for years now and nothing seems to be working. I signed up to the gym a few days ago but I don’t know anything about what exercises to do or what kind of things to eat for quick results! I’m so insecure and the fact nothing is working is demotivating. Any help from girls who have experienced the same issue? Any help would be appreciated, thanks

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