Am i gay for my best mate?

Hi

I am new to the forum and just wanted some advice about some feelings I've been having lately.

I think I'm probably bi and even though I am sometimes attracted to woman, I have some bizarre feelings about my male mates. There are three of us (all turned 18 this year), who have known eachother since we were little and always chill together. We are all into football etc and don't seem feminine (and best mates like really close) but I have heard rumours at least one may be gay.

Funny thing is I feel attracted to them but my best friend especially, call him Connor for arguments sake. Daniel (my othe mate) and him were over the other day and we played PS4 and chilled and after coming back from the kitchen I found the pair of them wrestling on the sofa and it spilled onto the floor. I had a weird reaction really.. basically got a hard on watching them and just sat observing for about twenty mins. I suppose I felt a tad jealous/ left out but was focused on my mate Connor. 

Any thoughts? Dunno if its just lads being lads but they seemed really into eachother.. like a play fight but serious lol

Maybe i"m just envious but like Connor as a best mate type thing.

Similar thing happened on the bus this week, I was sat behind them and cos they had shorts on (mini UK heat wave this week) and I had jeans on, this may seem daft, but felt a bit jealous whenever their legs touched..!  

Any ideas as to why I'm feeling this?

Cheers lads