Considering vehicles can not spawn kill you unless you decide to immediately run towards them after spawning with nothing but a gun, die and label that as 'spawn killing', I can't help myself but question your mentality. What kind of infantry would chose to go head on against tanks is beyond me.
Arms yourself better. Hide yourself from their vision. Pick them off from from afar. Or just duke it out with you driving another tank.
Practicing against bots first would be a good idea, as I would have had no clue what to do if I jumped right into a multiplayer match after installing.
Also, restart your steam and run the game again from it in order for your name to appear.