WOW.
It's always hard for me to accept, in this day and age of agressive sexual education, that someone can be 19 years old and so naive about HIV. Please don't take that as a personal attack on YOU. Your generation has literally grown up with HIV and yours should be one of the most higly educated and knowledgable groups about this disease. There is just SO much information out there, all of it for free! (To say nothing about the free condoms!)
There are three ways you can contract HIV.
1) UNPROTECTED anal/vaginal sex with an HIV+ partner
2) Sharing drug works with an HIV+ person
3) Mother to unborn child
You cannot contract HIV from kissing or oral sex.
YOU DO NOT HAVE HIV.
But you most defenitly have a great many anxiety issues that you need professional help for.............especially in light of your statement that you are getting so scared, so anxiety ridden that you are having suicidal thoughts. That is a HUGE red flag my friend! Please heed it and run, do NOT walk, to the nearest mental health clinic and tell them what you've just told us! There IS help for what ails you, but YOU have to be pro-active in your own mental as well as physical health.
You are a young and healthy young man, but if left untreated, these issues can and often do, destroy lives.
Please get help.
Peace
Greenlydia