Issues with engine hesitation

When I first start my car up, it starts up without hesitation, but once I start driving, the car seems to want to stall on me, so in order for it not to stall I have to sort of press on the brake pedal, and give it some gas at the same time. And when I come to a stop intersection I have to put it on neutral, step on the brake, and accelerate.
Also, when I shift on reverse it stalls completely.
So, can you please give me an answer to what it could be? Your help would be greatly appreciated.
Thank you so much.