We do not give our own opinions with according to.
- Incorrect: According to me, she should have resigned earlier.
- Correct: In my opinion, she should have resigned earlier.
To express your opinion, you can also use other expressions like I think…, I feel …, or I guess…
- I think she is right.
- I feel we are making a mistake.
- I guess that was a stupid thing to do.
- I think she is hiding something from us.
If you do not think that something is true or necessary, use I don’t think…
- I don’t think that we should wait for her.
- I don’t think that she will come.
- I don’t think that she is telling the truth.