am i suffering from anxiety??

Well first of all you aren't going crazy. Take a deep breath because everything will be okay.
Now you've gone through a rough patch which can cause specific or general anxiety. You say you're depressed, so I assume you've been to a counselor or a therapist (unless it's undiagnosed in which case you should go see your doctor, they're there to help). I would strongly recommend you go to your counselor/therapist/doctor about your social anxiety. There is a chance that with enough time it'll go away but it's not a guarantee.
I know it's probably not what you want to hear but if it is an anxiety disorder you need to talk to a professional. At the very least tell someone you're close to. Preferably an adult.
And if your depression hasn't been diagnosed I'd get that taken care of as well. It's quite common for depression and anxiety to correlate positively (ie. when you get one you also have the other).

it sounds like you have social anxiety, but because you said you are anxious by yourself as well i assume you have general anxiety. what you should try to figure out is why you are so anxious, it could be too much stress or low self esteem dragging you down. talk to a friend, family member or maybe even a therapist could help you.