I'am 18 But Keep Thinking About Marriage Am I Normal? Please help

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Unedited:
I like your page; Pls I need ur help because am just 18 and in ma 1st year in d uni. and  I keep thinkin of marriage and havin children.am I normal? Each tym a mature guy askes me out,I just tink of marriage.nd if a student askes me out,I refuse cos I feel he is not ready 4 marriage.I even imagine hw ma kids nd family wud b.pls no insults I just need help