Hi. i am 18 years old. i have been having wet dreams each 2 weeks, however, i always have dry orgasms when masturbating. please help i am worried!

Not to worry: The fact you have wet dreams shows all the appropriate plumbing is in place and working appropriately. Dry orgasms with masturbation are likely you putting too much pressure on yourself. Relax, don't care at all if you have a "dry orgasm" (it's neater anyway), and be confident that everything is fine and will work just fine when you need it to with a partner.

Sounds fine: It sounds like everything is working just fine. The first thing to do is to relax. Stress will only exaggerate your problem.