Gynecomastia. Mg per do would help?.

I'm a male of 19 yrs old... I was fat during my adolescent... Recently I lost my weight but my chest appears like a breast... They ain't so big but of a golf ball size... I'm afraid I might have breast gland because I used finasteride 6 months before.. Which made my condition more worse... I went off treatment and my chest size came back to normal but I don't know it's because of fat or gland... I still now didn't get it checked because my parents don't want me.. But I'm afraid it might become worse... My question is.. If I don't start treatment will my chest become more worse??... How will I know it's fat or gland??... I read about estrogen blocker like tamoxifen in Google.. Can I give it a try without consulting a personal doctor??... If I can how much mg per do would help??... Please help me!!!... I'm too stressed because of it.. :(