DiamondEvo

Last night i was on the highway and i was going around 50 60 mph and for some reason when i put the clutch in and shifted to 4th the gear didn't go in and it made a huge noise and slowed down my car. That night i noticed that the car wasn't running how its suppose to be and it had white smoke coming out from where the engine is on the passenger side and under the car i hear a strange noise too. My friend said its some rings that isnt letting compression into the pistons. And thats making the car slower then what its suppose to. I tried pushing onto the gas peddle but it wouldnt go as fast as it use to Help me please /: i live in San jacinto California if anyone lives around here that can help