Thank U 4 Posting.
In what type of game are U playing. If it is a freeroll then what to do is very different from mid stakes?
These are the questions you need to ask about your villains.
Are they
bluffing aggressively? Are they semi-bluffing aggressively?
Are they over betting? What hands are they over betting?
Are they check raising? Are they aggressive in all positions?
Are they floating? Then attacking any weakness?
Are they 3 betting or 4 betting preflop?
Are they leading into the preflop raiser? Are they only attacking you?
Are they only attacking certain board textures? Are they using the board texture to attack U on the turn and river?
If you see them showdown hands what is the hand strength relative to the board? Can you see why they would be aggressive? Where they being aggressive based on the other player's skill level or hand ranges?
Once you answer some of these questions for yourself post again with some details of the situations it will help you grow faster than such a general question as AGG players what do I do.
Also there are many posts already about this on this forum, you may wish to check those out.
Hope this helps