So scared found a lump in my head on top of skull

I’ve had a lump on top of my skull nearer the left side, when I first found it, i was getting a few headaches and when I forgot about it they went, I’ve recently been slightly losing balance and my right leg feels weak, then I went on google to look what it could be and all I’m seeing is brain tumours, and it’s all gone 10x worse and I feel like my body is playing tricks on me. I tell my mum and dad and they say it’s nothing, they say not to worry cuz they know what time like, but it really worry’s me cuz I feel the symptom