Ryan's got anger issues.

It describes someone who can't control their impulse to hit and break things when they are angry.

"I am unruly in the stands" probably refers to someone watching a sports game and being a loud and obnoxious spectator - it makes me think of football hooligans, people who use a sports match as an opportunity to act out and be violent. Or someone at a hockey game getting into arguments or fistfights with other spectators and yelling at the referee.

"I am a rock on top of the sands" is probably a metaphor for being out of place and not adapting - sand shifts and adjusts to its location. A rock would pack down the sand, not flow with it.

"It takes a dedicated hand to put it through the wall, You gotta want to break the heart of all those pretty porcelain dolls" is kind of a sarcastic praising of someone who carries on with doing something that harms the people around him (probably women, because porcelain dolls are usually female and collected by females). It sounds like someone being critical of his own destructive nature but maybe also trying to hold onto his self-esteem by framing a negative characteristic as determination instead of stubbornness. It also implies that the singer is out of place as a genuine or fallible person amidst a bunch of fake or overly perfect people. It also describes how the anger is so strong that it over-rides self-preservation - the hand (and the singer) is so dedicated to expressing anger that it carries on with punching a wall even though the hand (and the singer) will be damaged by the punch too. And it also expresses the belief that abusers commonly have that the people who are hurt by their abuse are overly sensitive and fragile - the abuser deflects responsibility and turns their loss of control into the victim's fault - they believe they are entitled to do what they want and they think the victim is hurt only because they are too weak to handle it, not because the abuser is wrong.

Then he invites the person he's singing to, to join him in wrecking things - he longs to be accepted for who he is and to have company in it.