Proper grammar is for fascist pricks.

Say your "Like"s and your "Um"s. Use your bad grammar and your slang. Unless the people around you are not understanding what you are saying, the way you speak is fine. Language is dynamic. It evolves. Modern standards are yesterdays improper speech. Don't deliberately change your speech patterns. Don't censor your fucking expletives. Speak to be understood, not to be proper.