No you cannot. You can only include a W-2 for 2017 in your 2017 tax return. The tax return you are filing now is a 2017 return. The 2018 return will not be filed until the first quarter of 2019.
If you had any tax withheld on your 2016 W-2s, you can file a 2016 return to get that back and you should have done that last year, whether or not you are claimed as a dependent. You would simply check the box saying you were being claimed a s a dependent on someone else's return in 2016. You would have to purchase a desktop CD to do your 2016 return now and file it by mail. Each year's program can only file returns for the one year.