25/Male - How do I know for sure im not gay? This is just one of my problems but this one needs to be resolved?

This might be a little complicated so bare with me. I was always attracted to females. All masturbation was directed towards females. I have always thought I was straight and really didnt give it much thought until recently and now its tearing me apart. The problems all started under 2 years ago. I'm was a virgin and still am (I lied about it to my friends when I was 16 and held the lie so it was killing me) and I felt it was a void in my life (plus depression and anxiety issues because of it) so I wanted to go out more and at least start meeting more girls and build my confidence. I go to a party and there was a girl there who was cool but she was fat and I was not sexually attracted to her. She wanted to hook up but I wasnt interested. But they say making female friends is a good first step to building confidence so I told her she was cool and we should hang out sometime and got her number. I now see that as being a mistake. At the time though, I figured where there’s one, there will be more, right? It didnt take long before I realized she wanted to be more than friends but me being a nice guy didnt want to hurt her feelings and kind of led her around a bit which was a jerk move I admit, I should have just told her the way it was. But at the time, I didnt have the heart because she really liked me and she was friends with a couple of my friends so I heard all about it. And they were starting to get pissed that I wasn’t really making any moves and it was driving her crazy. Well, long story short, I ended up getting SERIOUSLY pressured into going over her house for her graduation (one of her female friends kinda tore into me about it in a negative way, after I had smoked marijuana, and it made me feel paranoid) and I ended up going only because I didn’t want to be a jerk. Well, I get there (stoned and paranoid) and wasn’t too social since I just got ripped apart by her friend and confidence was lower already. Well night came and everyone left and it was me and her and another couple (male being my friend) crashing on the couch with a gay kid crashing on the floor near us. It was not my idea of a good setting to hook up (rather be completely alone with her) plus I wasn’t sexually attracted to this chick and I just couldn’t get it up. That killed my confidence more. The next day we all went to breakfast (again, pressured into it against my will) I took my own car and they were already there when I got there. I am walking up and just smile at her and then the gay kid goes "See, wtf is that". I knew they were talking about me and they acknowledged that they were. So now I know I’m being talked about. After breakfast I’m walking back to the table and as I’m coming back I hear “he’s probably gay and just doesnt know it yet". That messed with me because I thought they were talking about me again. Thats when I started questioning myself. I went home and continued with my life. I ended up going over my friends house later in the week with his girlfriend there (same couple I shared the couch with the other night) his parents there too and the second I walk in the door I hear "why doesn’t he just come out of the closet"-"ohh hi" toward me. I thought they were talking about me since they already did before and it really messed me up more. It led me into crazy paranoia, along with worse anxiety and depression about it since then. Then recently over this past winter season, I worked at a job that put me in close proximity to many very attractive females and I was intimidated and just couldnt make a move because of anxiety. Plus my shyness toward any sexual conversation due to not knowing what it’s like was killing me. Then the whole paranoia that friends/co-workers were testing me/messing with me about it and I just felt it was best to come clean about all my feelings so I did to certain people I trust. They responded well but I think I put my foot in my mouth and now they all think im gay and spread the word. Im not sexually attracted to men, I dont look up gay porn. I dont get hard thinking about or being around them. But I like having friends. Although most are male though?? Ive never had an official relationship with a woman and have practicly no female friends. The farthest ive been is second base (enjoyed) with a recent girl I was involved with and liked and I did fantasize about going all the way. Ive always had poor self confidence and now I have major performance anxiety, im always comparing myself to other men, I think people assume im gay and are throwing gay sexual innuendos at me. Does this make me gay? I am now seriously confused and really messed up about it. I always believed the right girl would come but now I question my entire life and have lost interest in everything. My family, friends, hobbies, work. I have thoughts of suicide too. Im seeing a psych and Im cinicly diagnosed with major anxiety, depression, and moderate add and ocd. Im on meds which only helps a