Guys how can you make it bigger?

there are devices that you can get online or a sex shop that claim to do this. I don't think its permanant.
if you are already thin its about as long naturally as its going to get on its own. however if you are heavy or large. it does get smaller the larger you get. weighloss does increase the length. as someone else stated too. there are pills I'm not sure if that is safe or permanent either or even works. just be happy with what you got. find what skills you can learn to make up the difference in pleasing in ways. just because someone is larger there doesn't mean that its going to matter to your partner if you don't use it well. some guys use smaller ones great enough to make up for being small. you can only put them in so deep anyways the rest is pretty much just useless if you can't use it all anyways.

Oh god. Get surgery ?

There are a number of techniques, all of which have side effects, some serious.

A few of the pills do in fact work, finding the good ones amidst the crap can be a challenge however, and most of those companies have nothing in the way of customer support, some going so far as just being scams with no product at all. The pills are also highly variable person to person, and to most will have only small effect.

Manual techniques (pumps, weights, etc) are very successful, but have very little (if any) effect on erect size, instead only increasing flaccid size by physically stretching the tissue. Extreme stretching can lead to erectile dysfuntion or in extreme cases the complete inability the have an erection

Plastic surgery is virtually guaranteed to increase size, but again, most of the gains are in flaccid size, not erect size, and surgery has the extreme risk of causing erectile dyfunction, or worse of damaging the nerves, making both erection and pleasure impossible.

The best method, quite honestly, is frequent use. The influx of blood during erection stimulates tissue growth. The gains will be small and slow to come compared to other methods, plus the tissue will return to it's previous size if you do not keep stick with it.

My advice: don't spend any money on this, you'll likely never see it again, and never get anything for it.

There are many pills and machines out there that say they can increase penis size but they're all crap. Surgery is the only option but there are risks of nerve damage.

Work on your sexual technique and stop worrying about the size.

If you have 5", that should be OK.