anyone know of any symptoms of stds or stis and am i able to go to the doctors to check without my parents knowing ( i’m 16)

I’m pretty sure once your 16 your doctor is bound by confidentiality to you. At least in Australia. I don’t know about elsewhere.

Unless like insurance documents what you went to the doctors for and what treatment you had and that gets mailed out to the insurance owners

In the US rules about confidentiality vary by what state you’re in, but if I’m not mistaken by 16 in most places you’d have confidentiality with your doctor as long as you aren’t a danger to yourself or others. If you’re in the US and have a Planned Parenthood near you that might be a really good option.