According to Catholicism, is it sinful to drink alcohol in order to get drunk? Say you drink and you know if you drink more you might get drunk, or you simply drink to get drunk.  You will become drunk and you know it, and no one is forcing you to drink.

Is that a sin, according to the Roman Catholic Church?
St. Thomas Aquinas explains (Summa Theologica II-II q. 150 a. 1 c.):


  Drunkenness may be understood in two ways.
  
  
  it may signify the defect itself of a man resulting from his drinking much wine, the consequence being that he loses the use of
  reason. In this sense drunkenness denotes not a sin, but a penal
  defect resulting from a fault.
  drunkenness may denote the act by which a man incurs this defect. This act may cause drunkenness in two ways.
  
  
  through the wine being too strong, without the drinker being cognizant of this: and in this way too, drunkenness may occur without
  sin, especially if it is not through his negligence, and thus we
  believe that Noah was made drunk as related in Gn. 9.
  In another way drunkenness may result from inordinate concupiscence and use of wine: in this way it is accounted a sin, and
  is comprised under gluttony as a species under its genus. For gluttony
  is divided into "surfeiting [Douay:,'rioting'] and drunkenness," which
  are forbidden by the Apostle (Rm. 13:13).
  
  


There's also Ga 5:19-21 (taken from this answer):


  Now the works of the flesh are manifest, which are fornication, uncleanness, immodesty, luxury, Idolatry, witchcrafts (φαρμακία), enmities, contentions, emulations, wraths, quarrels, dissensions, sects, Envies, murders, drunkenness, revellings, and such like. Of the which I foretell you, as I have foretold to you, that they who do such things shall not obtain the kingdom of God.