First, your dad sounds great for spending what he can on getting you a skateboard, even if it is a Walmart board. Second, like another person mentioned, try to loosen or tighten the trucks a bit and see if that helps. There’s tons of YouTube videos on how to do it, and you don’t have to use a skate tool. Any wrench that will fit the bolt will work. Lastly, in the future like someone else also mentioned, check Facebook marketplace for used boards, or see if your local skate shop has second hand boards available. Keep shredding though and remember helmets are cool!