Which of the following sentences is better?
1. Don't follow me, I am too lost.
2. Don't follow me, I am lost too.
Where should I put too when it means 'also'?
English Language Learners Stack Exchange is a question and answer site for speakers of other languages learning English. It only takes a minute to sign up.Sign up to join this community
It's all dependant on the position of the word too, the second one is correct.
Don't follow me, I'm lost too.
Here too is used to mean as well or also.
Don't follow me, I'm too lost
Because of the position of too the first sentence uses too to modify lost, but lost is absolute - you either are lost or you are not, there is no scale of 'lostness' even though you might hear people saying "I'm a little bit lost".
You might use "a little bit lost" when you are in a big city and you have taken a ride to an area you are unfamiliar with - you know your are in X City (so you are not lost) but you don't know the immediate area you are currently in (so you are lost).
You could say "Don't follow me, I'm also lost" but when you use too before lost it doesn't take the meaning of also
The definition of too at Dictionary.com provides a number of definitions and some examples. Definitions 1 and 2 are the ones in use in your two sentences.
Don't follow me, I am too lost.
Don't follow me, I am lost too.
When too means as well or also, it needs to go after any complements of the verb:
*I posted Dave too a letter. (wrong)
I bet him five pounds too.
However, it does not need to go after any adjuncts (adjuncts are extra bits of information, usually about when, where, why or how we did something that we usually put at the end of the sentence):
If too appears earlier in the sentence it will be interpreted as the degree adverb too, which is the word we find in sentences like too early or too much.
In the Original Poster's second sentence, too comes after the adjective lost. Here lost is the complement of the verb BE. So we understand the second sentence to mean:
In the first example, where too comes before the complement (before lost), we interpret too as a degree adverb. The fist sentence means something like:
Hope this helps!