I get influenced by people so easily.

I get infulenced by my enviourment and people so easily.

For example
If I don't want to drink alchoal but If someone try to convince me ( like alcohal is not bad, just have one, It's good to release tension) I would easily get infulenced by them and drink it even though I didn't want to.
Similarly If I don't feel like going somewhere but other person give some reasoning I would agree even though I strongly feel not going there I just can't find logic "why" and can't argue with them.

Any book that helps me build my identity with clear understanding of why I want certain things and stick to it and articulate it.