How can I convince my girlfriend to marry me?

Hay Every buddy

actually I'm in love with my girlfriend and she love me too, and I want to marry her because I'm afraid from breaking down our relationship because there are a lot of problem between us cause both of us are nervous.

so what I should do to convince her to accept my request to marry her.because when I asked her in the last time she said not now may be in the next year..i feel so sad.i really want her..
How can I convince my girlfriend to marry me?
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