Do I have Bi Polar? 24 years old

Hi everyone,


I came to the US from China when I was 14.
My parents didn't come with me. It was living with my grandparents most of the time.
I didn't really adapt to the new environment well. The school I went to was really bad.

I remember feeling very lonely, very frustrated the whole time. Then my condition just continued to deteriorate.
I became suicidal, even though I didn't really do it. The closest I came to committing was one time when I really had
the urge to end my life, but instead I was consciously using the other end of the blade to "cut" my wrist.

Throughout high school, my condition never really improved. I was very antisocial, quiet, always look depressed. Didn't really make a lot of friends. The condition got better in my senior year. One reason is that the pressure from academics was off.
I began to try to make friends and have fun, which worked to an extent.

In college, I think my condition improved also, but there're periods when I feel so down that I would shun all human interaction.
Sometimes, it's a couple of months, sometimes it's merely weeks. But I never felt really happy.
Part of it is just loneliness. I was never the outgoing type, kind of an introvert (even though I'm an extrovert by nature).
I was still depressed most of the time.

One day in the summer after my junior year in college, I woke up and felt so happy, so elated. and then for the next a couple of weeks, that mood continued. At that point, i felt i had gotten myself out of the depressed state, but unfortunately, the "down" state would return.
One time I was having dinner with a couple of friends who majored in psychology, I told them my conditions. they told me that I might have bipolar because a lot of times, depression would turn into bipolar.

So from that point on, I started to pay more attention to my mood swings.
A couple of things that noticed are
1. during the "manic" period, I'm extremely confident, happy, and ambitious. I would set goals for myself and have the vitality to actually pursue them.
2. had trouble sleeping for more than 6 hours a day. I would sleep at 12 and wake up at 5, 6.
3. I would always think grandiose thoughts, even though I was pretty sick of myself doing it

and then just last couple of weeks,
I became down again, a little worried, insecure and lack motivation, energy
and low sex drive.

Thanks for in advance for any suggestions