Every chance I get I seem to find my fingers drifting downstairs to have a play, it ends up happening everywhere I am I find myself in the toilets masturbating... Is this normal
Certainly normal masterbation will not harm you, and it may well do you good because it can release additional endorphines into the body which is good.
Just one word of warning and this is in connection with using sex toys roughly or exposing your genitalia to rough handling. This should be avoided for obvious reasons, not the least of which is the fact that the sexual organs are sensitive and should be treated as such.
Lastly, so as to avoid exposing yourself to unnecessary infections cleanliness should be important to you, and be aware that it is against the Law to expose yourself in a public place.
Oddly - if you are in UK - it is not as simple as achemedes says about exposing yourself [even were that your plan]. There are lots of public places where "dogging" occurs. That said it is probably best kept private or with a loving partner.
As Noel Coward [didn't] say " Don't take it out in public or they'll put you in the dock - and you won't come back" - M Python
If you enjoy it, there's no harm in it, it eases tension, and feels good, enjoy it I reckon.