Am I overweight?

I’m 18 years old, I’m 5’8 and about 150 pounds. I am SO insecure about myself I can’t ever feel sexy or good about my body with my boyfriend or even with myself at all. Every time I’m in public I feel like everyone is looking at me and thinking I’m fat and ugly. When I go to the gym I am having serious anxiety about how I look in my workout clothes. I just literally can’t even live my life without obsessing over how insecure I feel about my body. :(