Wow, I can totally relate to so many things in your post! First of all, I was diagnosed with bipolar II three years ago. Here are a few things I wish someone would have told me back then... Medication will NOT be enough in itself to manage your symptoms, there is no magic pill that will turn your whole life around. This mindset set me back years in my recovery. Individual therapy is a good thing, but I would highly suggest you try group therapy as well. This was key for me in learning to accept the fact that I have this disorder! I cannot tell you how beneficial it is to speak with people who know exactly how you feel, and who have so many of the same symptoms and experiences as you do.
When I was first diagnosed I was filled with so much shame and embarrassment. It was extremely painful and lonely. I didn't want people to think I was crazy. I didn't want to accept that I am different from "normal" people and spent a lot of time in denial. I only started truly making improvements when my mother forced me to start a intensive outpatient program for people with mood disorders and anxiety. Here I connected with all kinds of people with the same exact issues as I had. I have done a few different types of group therapies as well as individual. It is just a matter of being persistent in finding out what works for you!
What I can say for myself now is that I am at peace with having BP. I have a great support system and slowly opened up to more and more people who are close to me and that I trust (like family members especially.) You would be surprised at how good this actually feels eventually, even if the initial reaction of some aren't what you had expected. I still greatly fear the stigma that is attached to mental disorders, but it seems to be less important to me now having been educated about my condition. This is very important for you (and your support network) as well. With the proper combination of medication and skills learned in therapy I have been able to manage my depression and negative self thoughts so that they don't keep me from living a meaningful life.
So, the really sucky part is that it takes time! Shorter for some, longer for others. For me its taken three years but I feel better today than I have ever felt in my whole life. The wait sucked royally, but I am glad that I didn't give up. I am almost 25 as well, and really really want to find a romantic relationship with someone (which I have also never had) but anxiety seems to be a huge roadblock. I can't give you any advice on this topic but hope to make steps forward here as well. No matter what, don't give up on yourself. Your life can improve but you just have to do what it takes. Self esteem is so hard to come by but for me all I can hold on to is the determination to do whatever it takes to feel better and get the life I want, even if it causes real discomfort. I still have a long way to go, but even where I am at now is so much better than the place I was at then! I am new to this website but if you can find a way to message me I would be more than happy to talk some more with you, even if you don't end up having BP.