hi I understand your concern. Yeast infection can be treated with Anti fungal medication like flucanazole or terbanafin. Local application will be useful. Regarding masturbation At your age it is not a normal. You should wait for atleat for pubertal age. Though, masturbation is normal physiological function of our body it is one the method to satisfy sexual pleasure in absent of partner both sex and masturbation has same and has same end result to get satisfaction so no need to worry masturbation doesn t lead to any problem in your married life but constant thinking and feeling of guilt of masturbation will effect so don t think much. Do take advise of your parents also. Still have a query then feel free to ask. Thank you.