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Dear Teachers,

1. I just can't bring myself to forget it.

- What does "bring myself to forget it" mean here?

2. Come on, honey! natural beauty comes from within.

- Can I say "............from inside"?

3. Her new roommate really turns her off.

- What does "turn her off" mean here?

4. If he refuses to mend his ways, them ask him to move out. You can't let him wear out his welcome.

- What does "you can't let him wear out his welcome" mean here?

Thanks very much to Teachers,

Stevenukd.
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1. I just can't bring myself to forget it.

- What does "bring myself to forget it" mean here?
(bring oneself to do): force oneself to do (something unpleasant)

2. Come on, honey! natural beauty comes from within.

- Can I say "............from inside"?

3. Her new roommate really turns her off.

- What does "turn her off" mean here?

4. If he refuses to mend his ways, them ask him to move out. You can't let him wear out his welcome.

- What does "you can't let him wear out his welcome" mean here?

wear out one's welcome
Visit for longer than one's host wants, as in She wanted to stay
another few days but feared she would wear out her welcome. This
expression uses wear out in the sense of "exhaust" or "use up."
[Mid-1800s]
http://www.answers.com/topic/wear-out-one-s-welcome
Comments  
1. I just can't bring myself to forget it.

- What does "bring myself to forget it" mean here? - It means to put out of their mind indefinitely.

2. Come on, honey! natural beauty comes from within.

- Can I say "............from inside"? - It would be pretty awkward, but I am not sure. 'Natural' should be capitalized.

3. Her new roommate really turns her off.

- What does "turn her off" mean here? - Well, usually when you turn somebody off it means that you stop them from feeling sexually towards them. Here, though, I think it means it stoppe dher from pursuing and/or liking something, but the context makes is a bit blurry.

4. If he refuses to mend his ways, them ask him to move out. You can't let him wear out his welcome.

- What does "you can't let him wear out his welcome" mean here? - It means that you cannot let him make his presence there aggrivating or upsetting for the others, in which case they would want him to leave.
 Marius Hancu's reply was promoted to an answer.