Like I'm a 14 year old boy and I have medium hair but the problem is that my hair are really thin.

Like when I spike up my hair that there's like alot of gaps in between like all the hairs are spiked up but you know it's just thin.

Like it's not like I'm going bald or anything and not even loosing hair but just I have thin hair.

So will going bald and then the hair grows back, will it grow back thicker or is there any medicines to make ma hair thicker?

For thin hair you must use a shampoo available for that kind of problem or else you can use a volume shampoo to give more volume to your hair,instead of gels you can use a volume lotion, there are lots of brands, in keune brand uyou will find these ranges.