Help me keep my mouth shut?

Hey! So I’m a very blunt person and I don’t mean to hurt anyone or make anyone angry but I always feel the need to tell how I really feel about something and I say it exactly how it is and I’m also very tall and intimidating so that doesn’t help my case. I’m not sure if I should keep my mouth shut from now on but I really don’t want to because I don’t like lying and I h*te bottling things up , please give me tips on how to have a not so intimidating approach and a bit softer?
Help me keep my mouth shut?
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