"also" and "as well" may directly to the same meaning (too, in addition, besides, moreover, equally..), but they are different from echo other in terms of how you use it in sentence.
* You can say this: I don't want to be alone. Also, I love your company.
* But you cannot say it this way: I don't want to be alone. As well, I love your company.
You can use "also" at the beginning of your sentence but you cannot use "as well" that way, you can only use " as well" either at the middle or at the end.