Pffft. At 18, there's no way you should require viagra. Especially if you can get it up on your own and masturbate to completion. If you are feeling a bit worried, you can go get a physical from your doctor who will undoubtedly tell you everything is physically okay.
I suffered from this same problem in my early experiences with women. Masturbating less will help somewhat, but what also will help is to masturbate differently -- pay attention to how your girl does it, and try to simulate that more carefully on your own. Use less pressure, slower or faster strokes, whatever. Learn how to come on your own with similar sensations and it will be easier.
Also, pay attention when you come to the mindset you are in and the contracting muscles of your groin area. Then, when she is working on you concentrate on replicating these feelings. If you just lie there and do nothing except worry about the fact you are not coming, it's not going to happen.
Finally, if what she is doing just isn't keeping it going, help the girl out and show her either with your hand or by talking to her and guiding your hand.
For oral sex, it will help if she can take it at a bit of an angle so that the head of your penis hits the sides of her mouth (or her throat if she can deep throat), as the added friction will help you out. Also, it is usually easier to come via oral after already had sex and come once, since your penis is more sensitive.
It can be a lot of hard work (pardon the pun) to get it done the first time, but after that it gets easier and easier.
Sit back, don't worry & enjoy!
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