Hi
Soyuzturtle ,
Your rocket needs some rebalancing between the main core and the boosters indeed.
I've made one for you, using only free parts, with the build space that's available for you (as apparently you play with base game):
The payload is the silver part, it weighs nearly 50 tons.
If you fly it well, the boosters and the first stage are normally enough to reach orbit. Then the upper stage can perform the injection burn. You'll have a decent quantity of remaining fuel, but you'll have to aerobrake to be able to insert it in Low Mars Orbit.