Please don't worry about it affecting future employment. It won't in any way - everything between you and the GP or talking therapies is 100% confidential. You would never have to declare it to an employer. So many people suffer from things like this, that it needn't get in the way of things like employment.
Please try to think about how this is making you suffer now - it's really important you do something, for you, because life doesn't have to be difficult like this.
I have a few close friends who are GPs and they're very used to people coming in with anxiety problems, and trained to refer them on to things like the Talking Therapies. If you happen to get a GP who doesn't respond in the way you want, see another one, because this stuff IS out there and really can make a huge difference - I know from first hand experience. I can tell you that the talking therapies is all approached in the way YOU want it to be - so for example, I had choices between group, telephone and face-to-face and always felt supported in my choices. At the same time as referring me on to talking therapies, the GP gave me a prescription, but I explained to them and the talking therapies people that I wanted to focus on learning coping strategies not medicalising, and was always supported in my decision.
I know it can be hard to make the first step but it is the first step to making things a lot better. Maybe try writing down a list of how you feel, to show the GP, incase you forget everything you want to say. This can give them a good picture of your symptoms.
Please, please do make that appointment, just pick up the phone now and give them a ring, it will be worth it. xx