Not sure why I keep feeling this way.

My whole life low self esteem has been an issue hovering in the background. I just suppress it. Well it's finally become something I'm directly confronting in therapy. And it was better for a while. Then a stressful event occured and now it's really bothering me again. This bipolar depression doesn't really help matters. College doesn't start back up until August but I already feel the stress from that. I'm not exactly sure how to combat this feeling.