lonely and emotionless

I feel really petty for this, I'm 20 years old and ended the first and only relationship of my life about a year and a half ago. I don't, by any means, miss my ex. I miss myself. I feel completely apathetic, and i'd thought by now it would have passed. I feel like i have to fake any emotion just to seem like a normal person. And although i want so badly to feel that bond again, it seems like i just can't. I can't even relate to friends like i did before. When people flirt with me or are really touchy feely it just makes me extremely uncomfortable, almost angry. I don't get excited about new love-interests, and i do try. I give everyone a fair chance, and i'm not shallow. The cutesiness and chivalry i used to melt over just feels really fake and pathetic to me.
Any advice?
I've previously been diagnosed with bipolar and was typically a rapid cycler before. I've felt emotionally numb since two weeks after the break-up.

Hi ~ I don't know alot about BiPolar, I'll admit. But were you extremely hurt and broken up after your breakup with your ex? Did you have a very hard time afterwards? I'm just wondering if you've just put up an emotional wall now to keep from being hurt again.

Are you seeing a therapist? I hope so since you've been diagnosed with BiPolar. If you are, talk this over with your therapist. If you're not, you might think about seeing one. I think this is something that is best discussed with one.

I wish you the very best. Please take care & God bless. Hugs, Lee

I had a hard time for a couple weeks afterwards, but after that I just kinda became focused on hanging out and meeting new friends.. I guess I really don't know when this actually started, but I'm hoping to start seeing a psychologist tomorrow.