just started, am i forced to be sober forever???

I'm nearing 21 and just started wellbutrin..... I really don't want to miss out on drinking and smoking (weed) with my friends. I'm in college and not doing either of these is just not an option for me. How do I approach things like this safely?? Is there a way to build a tolerance to alcohol on this drug?? I wasn't told anything about mixing it with alc/weed when prescribed, despite my psych knowing I drink and smoke... please im really worried I won't be able to, someone tell me how bad it is...