Fold preflop....having said that, you need to look at the rest of your streets, cause you have a bigger problem than starting hand selection.

Do not bet the flop - you are in lead position with 5 people to act behind you. You have TPGK with a flop that contains both straight and flush draws. If one person calls....the rest will have odds to call...and then puts you in a position you do not want on the turn. Check this and see what happens...and then go from there.

Do not bet the turn - You have TPGK and had 3 callers on your flop bet...not only that the turn was an over.

Check/fold or check/call the river - not a good card for you and this guy isn't going away...hope for a cheap showdown.

After saying all of this...you need to learn pot management...this is not a hand you want to play a big pot with, so leading out the flop/turn/river is not a good idea, as this makes the pot bigger which makes the bets bigger on every street. You are playing a mediocre hand for stacks...not recommended. This is also why leading out your premium hands is a good idea...the pot gets irresistably big for other players on the later streets and then you can stack them.