Do try and stick with it.
You don't feel better now, but anti-depressants usually take at least 2 weeks before they start taking effect. You talk about not having any motivation to do anything beyond just function, but try to keep in mind that that's likely a symptom of the depression. Let the medication kick in and help and then reevaluate how you feel. The medications aren't going to help the underlying cause if its life circumstances that are making you depressed. But what they will do is allow you to have the energy to take hold of your life again and make the positive changes you need.
You're worried about weight gain. Well, like Jtrekkie said, you're already monitoring your diet. That's good. The next step is to try and incorporate exercise into your routine. You don't have to suddenly become a gym rat though. Just small things. Walking more or doing some calisthenics when you wake up can help. Drinking more water so you feel fuller and don't accidentally overeat can also help. Weight gain isn't a foregone conclusion with anti-depressants.
You're upset about being seen by people as having a mental disorder. Its nothing to be ashamed of. You have an illness. So you've gone to the doctor in order to become well again. There is nothing shameful in that at all. There is a strange stigma against seeking help for mental illness, but its ridiculous. Depression is a completely treatable illness and you have a right to feel better, to be able to function and to live your life without feeling like crap. Don't let the perceptions of others, real or imagined, stop you from taking steps to help yourself.
Anyway, hope you feel better dude <;