It's very likely that there are sexual health clinics near you. If you book an appointment they will ask you some questions and then give you the appropriate test/tests.
Alternatively, you could look up the symptoms you might be feeling via the internet, but be warned: it's very easy to self diagnose yourself with something completely inaccurate, and this method of self diagnosis is usually used as a precursor to seeing a professional.
If you don't have access to a sexual health clinic, then perhaps you could talk to your school/college nurse about it. If that option is also unavailable, then perhaps book an appointment with your local GP/doctor.
It's recommended that sexually active young people get tested regularly of STDs, whether they're actually having sex or not. It's nothing to be ashamed of and you'll be treated respectfully by all the professionals I've suggested.
...if he has an std...?
Settle down with 1 person you know will be faithful and has no STD.
he has an std
Yes you can to avoid STD and pregnancy
It's perfectly normal and safe to eat it, but if it's not your own, you can get an STD
They get STD's and DIE. most likely get a miscarriage. and you cant get an std that way
YOU CAN GET STD'S AND (if your a girl) YOU CAN GET cervical CANCER LET ALONE A VIRUS!!
no, it is not normal. This means the girl has a STD. Sorry...
STD transmission occurs from any type of sex with an infected person including genital, oral, anal, and sex toys.
STD's usually don't prevent pregnancy. Are you trying or are just wanting to know?
AIDS
Not necessarily. If he has an STD, that does not mean he got it from sleeping around. He could have had it from birth (his parents) or he could have gotten it from a girl before he was married.