YOU SAID:

I can't do this alone, even though I am strong!

INTO JAPANESE

私は強いのにこれだけできない!

BACK INTO ENGLISH

Not only this but I am strong!

INTO JAPANESE

だけでなく、このしかし、私は強い!

BACK INTO ENGLISH

Just not this but I am strong!

INTO JAPANESE

だけではない、このしかし、私は強い!

BACK INTO ENGLISH

Just not this but I am strong!