Hi Lolo,
Welcome to psych central.
Sorry you feel so bad when life looks good from the outside.
I know what that is like, living with depression when your life is good in all important ways.
I guess just being honest with your doctor that the medication has helped....up to a point and share your concerns about changing.
3 weeks isn't long when it comes to mental health medication so you may feel more benefits over the next couple of months.
Maybe some talking therapy if you can have access to it to help you with your efforts to do things and make friends.

I was lucky, my husband agreed to couples counselling and it really helped us. It also helped him to understand my depression better and what small gestures etc. can help me.
It also helped me to understand better how he thinks and what he might need.

Best of luck as you try to find a way forward. I hope you find help and support here, people here have helped me through some very dark times and I hope you find encouragement here too.